ipv4: Fix crash in dst_release when udp_sendmsg route lookup fails.
authorDavid S. Miller <davem@davemloft.net>
Thu, 3 Mar 2011 18:38:01 +0000 (10:38 -0800)
committerDavid S. Miller <davem@davemloft.net>
Thu, 3 Mar 2011 18:38:01 +0000 (10:38 -0800)
commit06dc94b1ed05f91e246315afeb1c652d6d0dc9ab
tree7219badb5e324077ad9d6f22981dc155a9fe8610
parent1558310d4942427f4fd19e8ae26ca0878ab10879
ipv4: Fix crash in dst_release when udp_sendmsg route lookup fails.

As reported by Eric:

[11483.697233] IP: [<c12b0638>] dst_release+0x18/0x60
 ...
[11483.697741] Call Trace:
[11483.697764]  [<c12fc9d2>] udp_sendmsg+0x282/0x6e0
[11483.697790]  [<c12a1c01>] ? memcpy_toiovec+0x51/0x70
[11483.697818]  [<c12dbd90>] ? ip_generic_getfrag+0x0/0xb0

The pointer passed to dst_release() is -EINVAL, that's because
we leave an error pointer in the local variable "rt" by accident.

NULL it out to fix the bug.

Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/ipv4/udp.c