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mISDN: array underflow in open_bchannel()

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There are two channels here.  User space starts counting channels at one
but in the kernel we start at zero.  If the user passes in a zero
channel that's invalid and could lead to memory corruption.

Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Dan Carpenter
2012-03-26 21:20:48 +00:00
committed by David S. Miller
parent c54e9bd38a
commit 819a100846
7 changed files with 7 additions and 7 deletions
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2
drivers/isdn/hardware/mISDN/hfcsusb.c
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@@ -486,7 +486,7 @@ open_bchannel(struct hfcsusb *hw, struct channel_req *rq)
{
struct bchannel *bch;
if (rq->adr.channel > 2)
if (rq->adr.channel == 0 || rq->adr.channel > 2)
return -EINVAL;
if (rq->protocol == ISDN_P_NONE)
return -EINVAL;