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caif-hsi: Added sanity check for length of CAIF frames
Added sanity check for length of CAIF frames, and tear down of CAIF link-layer device upon protocol error. Signed-off-by: Sjur Brændeland <sjur.brandeland@stericsson.com> Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Daniel Martensson
David S. Miller
parent
28bd204942
commit
5bbed92d3d
@ -18,6 +18,7 @@
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#include <linux/sched.h>
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#include <linux/if_arp.h>
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#include <linux/timer.h>
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#include <linux/rtnetlink.h>
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#include <net/caif/caif_layer.h>
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#include <net/caif/caif_hsi.h>
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@ -348,8 +349,7 @@ static void cfhsi_tx_done_cb(struct cfhsi_drv *drv)
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cfhsi_tx_done(cfhsi);
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}
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static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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bool *dump)
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static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
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int xfer_sz = 0;
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int nfrms = 0;
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@ -360,8 +360,7 @@ static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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(desc->offset > CFHSI_MAX_EMB_FRM_SZ)) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n",
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__func__);
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*dump = true;
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return 0;
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return -EPROTO;
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}
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/* Check for embedded CAIF frame. */
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@ -379,6 +378,12 @@ static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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len |= ((*(pfrm+1)) << 8) & 0xFF00;
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len += 2; /* Add FCS fields. */
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/* Sanity check length of CAIF frame. */
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if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n",
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__func__);
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return -EPROTO;
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}
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/* Allocate SKB (OK even in IRQ context). */
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skb = alloc_skb(len + 1, GFP_ATOMIC);
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@ -423,18 +428,16 @@ static int cfhsi_rx_desc(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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if (desc->header & CFHSI_PIGGY_DESC)
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xfer_sz += CFHSI_DESC_SZ;
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if (xfer_sz % 4) {
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if ((xfer_sz % 4) || (xfer_sz > (CFHSI_BUF_SZ_RX - CFHSI_DESC_SZ))) {
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dev_err(&cfhsi->ndev->dev,
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"%s: Invalid payload len: %d, ignored.\n",
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__func__, xfer_sz);
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xfer_sz = 0;
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*dump = true;
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return -EPROTO;
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}
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return xfer_sz;
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}
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static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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bool *dump)
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static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi)
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{
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int rx_sz = 0;
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int nfrms = 0;
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@ -446,8 +449,7 @@ static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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(desc->offset > CFHSI_MAX_EMB_FRM_SZ))) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid descriptor.\n",
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__func__);
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*dump = true;
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return -EINVAL;
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return -EPROTO;
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}
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/* Set frame pointer to start of payload. */
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@ -469,13 +471,6 @@ static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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u8 *pcffrm = NULL;
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int len = 0;
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if (WARN_ON(desc->cffrm_len[nfrms] > CFHSI_MAX_PAYLOAD_SZ)) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid payload.\n",
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__func__);
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*dump = true;
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return -EINVAL;
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}
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/* CAIF frame starts after head padding. */
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pcffrm = pfrm + *pfrm + 1;
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@ -484,6 +479,13 @@ static int cfhsi_rx_pld(struct cfhsi_desc *desc, struct cfhsi *cfhsi,
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len |= ((*(pcffrm + 1)) << 8) & 0xFF00;
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len += 2; /* Add FCS fields. */
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/* Sanity check length of CAIF frames. */
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if (unlikely(len > CFHSI_MAX_CAIF_FRAME_SZ)) {
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dev_err(&cfhsi->ndev->dev, "%s: Invalid length.\n",
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__func__);
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return -EPROTO;
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}
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/* Allocate SKB (OK even in IRQ context). */
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skb = alloc_skb(len + 1, GFP_ATOMIC);
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if (!skb) {
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@ -528,7 +530,6 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
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int res;
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int desc_pld_len = 0;
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struct cfhsi_desc *desc = NULL;
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bool dump = false;
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desc = (struct cfhsi_desc *)cfhsi->rx_buf;
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@ -544,16 +545,20 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
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spin_unlock_bh(&cfhsi->lock);
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if (cfhsi->rx_state.state == CFHSI_RX_STATE_DESC) {
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desc_pld_len = cfhsi_rx_desc(desc, cfhsi, &dump);
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desc_pld_len = cfhsi_rx_desc(desc, cfhsi);
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if (desc_pld_len == -ENOMEM)
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goto restart;
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if (desc_pld_len == -EPROTO)
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goto out_of_sync;
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} else {
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int pld_len;
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if (!cfhsi->rx_state.piggy_desc) {
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pld_len = cfhsi_rx_pld(desc, cfhsi, &dump);
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pld_len = cfhsi_rx_pld(desc, cfhsi);
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if (pld_len == -ENOMEM)
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goto restart;
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if (pld_len == -EPROTO)
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goto out_of_sync;
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cfhsi->rx_state.pld_len = pld_len;
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} else {
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pld_len = cfhsi->rx_state.pld_len;
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@ -567,7 +572,7 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
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cfhsi->rx_state.piggy_desc = true;
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/* Extract piggy-backed descriptor. */
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desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi, &dump);
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desc_pld_len = cfhsi_rx_desc(piggy_desc, cfhsi);
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if (desc_pld_len == -ENOMEM)
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goto restart;
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@ -577,15 +582,10 @@ static void cfhsi_rx_done(struct cfhsi *cfhsi)
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*/
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memcpy((u8 *)desc, (u8 *)piggy_desc,
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CFHSI_DESC_SHORT_SZ);
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}
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}
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if (unlikely(dump)) {
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size_t rx_offset = cfhsi->rx_ptr - cfhsi->rx_buf;
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dev_err(&cfhsi->ndev->dev, "%s: RX offset: %u.\n",
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__func__, (unsigned) rx_offset);
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print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE,
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cfhsi->rx_buf, cfhsi->rx_len + rx_offset);
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if (desc_pld_len == -EPROTO)
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goto out_of_sync;
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}
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}
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memset(&cfhsi->rx_state, 0, sizeof(cfhsi->rx_state));
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@ -622,6 +622,13 @@ restart:
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BUG();
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}
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mod_timer(&cfhsi->rx_slowpath_timer, jiffies + 1);
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return;
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out_of_sync:
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dev_err(&cfhsi->ndev->dev, "%s: Out of sync.\n", __func__);
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print_hex_dump_bytes("--> ", DUMP_PREFIX_NONE,
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cfhsi->rx_buf, CFHSI_DESC_SZ);
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schedule_work(&cfhsi->out_of_sync_work);
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}
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static void cfhsi_rx_slowpath(unsigned long arg)
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@ -804,6 +811,17 @@ static void cfhsi_wake_down(struct work_struct *work)
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}
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static void cfhsi_out_of_sync(struct work_struct *work)
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{
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struct cfhsi *cfhsi = NULL;
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cfhsi = container_of(work, struct cfhsi, out_of_sync_work);
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rtnl_lock();
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dev_close(cfhsi->ndev);
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rtnl_unlock();
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}
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static void cfhsi_wake_up_cb(struct cfhsi_drv *drv)
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{
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struct cfhsi *cfhsi = NULL;
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@ -1023,6 +1041,7 @@ int cfhsi_probe(struct platform_device *pdev)
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/* Initialize the work queues. */
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INIT_WORK(&cfhsi->wake_up_work, cfhsi_wake_up);
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INIT_WORK(&cfhsi->wake_down_work, cfhsi_wake_down);
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INIT_WORK(&cfhsi->out_of_sync_work, cfhsi_out_of_sync);
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/* Clear all bit fields. */
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clear_bit(CFHSI_WAKE_UP_ACK, &cfhsi->bits);
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@ -52,8 +52,9 @@ struct cfhsi_desc {
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/*
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* Maximum bytes transferred in one transfer.
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*/
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/* TODO: 4096 is temporary... */
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#define CFHSI_MAX_PAYLOAD_SZ (CFHSI_MAX_PKTS * 4096)
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#define CFHSI_MAX_CAIF_FRAME_SZ 4096
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#define CFHSI_MAX_PAYLOAD_SZ (CFHSI_MAX_PKTS * CFHSI_MAX_CAIF_FRAME_SZ)
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/* Size of the complete HSI TX buffer. */
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#define CFHSI_BUF_SZ_TX (CFHSI_DESC_SZ + CFHSI_MAX_PAYLOAD_SZ)
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@ -143,6 +144,7 @@ struct cfhsi {
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struct list_head list;
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struct work_struct wake_up_work;
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struct work_struct wake_down_work;
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struct work_struct out_of_sync_work;
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struct workqueue_struct *wq;
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wait_queue_head_t wake_up_wait;
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wait_queue_head_t wake_down_wait;
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