Commit e60b13e4 authored by Anton Protopopov's avatar Anton Protopopov Committed by David S. Miller

mISDN: prevent possible NULL pointer dereference

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: default avatarAnton Protopopov <>
Signed-off-by: default avatarDavid S. Miller <>
parent 449f14f0
......@@ -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->, cnt);
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