]> git.proxmox.com Git - mirror_ubuntu-disco-kernel.git/commit
x25: Prevent crashing when parsing bad X.25 facilities
authorDan Rosenberg <drosenberg@vsecurity.com>
Fri, 12 Nov 2010 20:44:42 +0000 (12:44 -0800)
committerDavid S. Miller <davem@davemloft.net>
Fri, 12 Nov 2010 20:44:42 +0000 (12:44 -0800)
commit5ef41308f94dcbb3b7afc56cdef1c2ba53fa5d2f
treec21d9c1c7f2792b0889432988d42e9b90f953358
parente68e6133e2daef6fc40e91621a1e26938e428e9e
x25: Prevent crashing when parsing bad X.25 facilities

Now with improved comma support.

On parsing malformed X.25 facilities, decrementing the remaining length
may cause it to underflow.  Since the length is an unsigned integer,
this will result in the loop continuing until the kernel crashes.

This patch adds checks to ensure decrementing the remaining length does
not cause it to wrap around.

Signed-off-by: Dan Rosenberg <drosenberg@vsecurity.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
net/x25/x25_facilities.c