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fore200e: Fix incorrect checks of NULL pointer dereference

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In fore200e_send and fore200e_close, the pointers from the arguments
are dereferenced in the variable declaration block and then checked
for NULL. The patch fixes these issues by avoiding NULL pointer
dereferences.

Signed-off-by: Aditya Pakki <pakki001@umn.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Aditya Pakki 2019-12-15 10:14:51 -06:00 committed by David S. Miller
parent 03d51c4fc5
commit bbd20c939c
1 changed files with 18 additions and 7 deletions
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25
drivers/atm/fore200e.c
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@ -1414,12 +1414,14 @@ fore200e_open(struct atm_vcc *vcc)
static void
fore200e_close(struct atm_vcc* vcc)
{
struct fore200e* fore200e = FORE200E_DEV(vcc->dev);
struct fore200e_vcc* fore200e_vcc;
struct fore200e* fore200e;
struct fore200e_vc_map* vc_map;
unsigned long flags;
ASSERT(vcc);
fore200e = FORE200E_DEV(vcc->dev);
ASSERT((vcc->vpi >= 0) && (vcc->vpi < 1<<FORE200E_VPI_BITS));
ASSERT((vcc->vci >= 0) && (vcc->vci < 1<<FORE200E_VCI_BITS));
@ -1464,10 +1466,10 @@ fore200e_close(struct atm_vcc* vcc)
static int
fore200e_send(struct atm_vcc *vcc, struct sk_buff *skb)
{
struct fore200e* fore200e = FORE200E_DEV(vcc->dev);
struct fore200e_vcc* fore200e_vcc = FORE200E_VCC(vcc);
struct fore200e* fore200e;
struct fore200e_vcc* fore200e_vcc;
struct fore200e_vc_map* vc_map;
struct host_txq* txq = &fore200e->host_txq;
struct host_txq* txq;
struct host_txq_entry* entry;
struct tpd* tpd;
struct tpd_haddr tpd_haddr;
@ -1480,9 +1482,18 @@ fore200e_send(struct atm_vcc *vcc, struct sk_buff *skb)
unsigned char* data;
unsigned long flags;
ASSERT(vcc);
ASSERT(fore200e);
ASSERT(fore200e_vcc);
if (!vcc)
return -EINVAL;
fore200e = FORE200E_DEV(vcc->dev);
fore200e_vcc = FORE200E_VCC(vcc);
if (!fore200e)
return -EINVAL;
txq = &fore200e->host_txq;
if (!fore200e_vcc)
return -EINVAL;
if (!test_bit(ATM_VF_READY, &vcc->flags)) {
DPRINTK(1, "VC %d.%d.%d not ready for tx\n", vcc->itf, vcc->vpi, vcc->vpi);