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| author | Anton Protopopov <a.s.protopopov@gmail.com> | 2016-02-17 17:19:56 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2016-02-18 20:59:35 +0100 |
| commit | e60b13e4f56fc56cc0dea845ce0711773d514149 (patch) | |
| tree | c0f9077bbd5b4eb462d8865d526459335b0c61ef | |
| parent | net: caif: fix erroneous return value (diff) | |
| download | linux-e60b13e4f56fc56cc0dea845ce0711773d514149.tar.xz linux-e60b13e4f56fc56cc0dea845ce0711773d514149.zip | |
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: Anton Protopopov <a.s.protopopov@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | drivers/isdn/hardware/mISDN/netjet.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/isdn/hardware/mISDN/netjet.c b/drivers/isdn/hardware/mISDN/netjet.c index 8e2944784e00..afde4edef9ae 100644 --- a/drivers/isdn/hardware/mISDN/netjet.c +++ b/drivers/isdn/hardware/mISDN/netjet.c @@ -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; |