SA1111: Eliminate use after free
authorJulia Lawall <julia@diku.dk>
Fri, 30 Jul 2010 15:17:28 +0000 (17:17 +0200)
committerRussell King <rmk+kernel@arm.linux.org.uk>
Fri, 30 Jul 2010 22:19:30 +0000 (23:19 +0100)
commitf2d2420bbf4bb125ea5f2e1573d4da6b668fc78a
treeb6a074ce9a14e7fc1f99641bb3e47b83417f34eb
parent74bc80931c8bc34d24545f992a35349ad548897c
SA1111: Eliminate use after free

__sa1111_remove always frees its argument, so the subsequent reference to
sachip->saved_state represents a use after free.  __sa1111_remove does not
appear to use the saved_state field, so the patch simply frees it first.

A simplified version of the semantic patch that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E,E2;
@@

__sa1111_remove(E)
...
(
  E = E2
|
* E
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
arch/arm/common/sa1111.c