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mISDN: prevent possible NULL pointer dereference

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A return value of the bchannel_get_rxbuf() function is compared with the
positive ENOMEM value instead of the negative -ENOMEM value to detect a
memory allocation problem. Thus, after a possible memory allocation
failure the bc->bch.rx_skb will be NULL which will lead to a NULL
pointer dereference.

Signed-off-by: Anton Protopopov <a.s.protopopov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Anton Protopopov 2016-02-17 11:19:56 -05:00 committed by David S. Miller
parent 449f14f01f
commit e60b13e4f5
1 changed files with 1 additions and 1 deletions
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drivers/isdn/hardware/mISDN/netjet.c
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@ -392,7 +392,7 @@ read_dma(struct tiger_ch *bc, u32 idx, int cnt)
}
stat = bchannel_get_rxbuf(&bc->bch, cnt);
/* only transparent use the count here, HDLC overun is detected later */
if (stat == ENOMEM) {
if (stat == -ENOMEM) {
pr_warning("%s.B%d: No memory for %d bytes\n",
card->name, bc->bch.nr, cnt);
return;