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p54: fix a NULL pointer dereference bug

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If the RSSI calibration table was not found or not parsed properly,
priv->rssi_db will be NULL, p54_rssi_find needs to be able to deal
with that.

Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Acked-by: Christian Lamparter <chunkeey@googlemail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Felix Fietkau 2011-02-27 22:19:22 +01:00 committed by John W. Linville
parent c2a7dca0ce
commit a5a7103fe1
1 changed files with 5 additions and 2 deletions
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7
drivers/net/wireless/p54/eeprom.c
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@ -524,10 +524,13 @@ err_data:
struct p54_rssi_db_entry *p54_rssi_find(struct p54_common *priv, const u16 freq) struct p54_rssi_db_entry *p54_rssi_find(struct p54_common *priv, const u16 freq)
{ {
struct p54_rssi_db_entry *entry = (void *)(priv->rssi_db->data + struct p54_rssi_db_entry *entry;
priv->rssi_db->offset);
int i, found = -1; int i, found = -1;
if (!priv->rssi_db)
return &p54_rssi_default;
entry = (void *)(priv->rssi_db->data + priv->rssi_db->offset);
for (i = 0; i < priv->rssi_db->entries; i++) { for (i = 0; i < priv->rssi_db->entries; i++) {
if (!same_band(freq, entry[i].freq)) if (!same_band(freq, entry[i].freq))
continue; continue;