From: Anton Protopopov <a.s.protopopov@gmail.com>
To: Karsten Keil <isdn@linux-pingi.de>,
netdev@vger.kernel.org, linux-kernel@vger.kernel.org
Cc: Anton Protopopov <a.s.protopopov@gmail.com>
Subject: [PATCH] mISDN: prevent possible NULL pointer dereference
Date: Wed, 17 Feb 2016 11:19:56 -0500 [thread overview]
Message-ID: <1455725996-10538-1-git-send-email-a.s.protopopov@gmail.com> (raw)
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>
---
drivers/isdn/hardware/mISDN/netjet.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/isdn/hardware/mISDN/netjet.c b/drivers/isdn/hardware/mISDN/netjet.c
index 8e29447..afde4ed 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;
--
2.6.5
next reply other threads:[~2016-02-17 16:19 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-02-17 16:19 Anton Protopopov [this message]
2016-02-18 20:00 ` [PATCH] mISDN: prevent possible NULL pointer dereference David Miller
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