tree 57618062dd88af2c186610a5f880df48257f8d24
parent 8dcd038a13b8e322c49fe0d3e31a0deaba4fd5fd
author Julia Lawall <julia@diku.dk> 1249628434 +0200
committer Benjamin Herrenschmidt <benh@kernel.crashing.org> 1250728037 +1000

powerpc/fsl_rio: Add kmalloc NULL tests

Check that the result of kmalloc/kzalloc is not NULL before dereferencing it.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression *x;
identifier f;
constant char *C;
@@

x = \(kmalloc\|kcalloc\|kzalloc\)(...);
... when != x == NULL
    when != x != NULL
    when != (x || ...)
(
kfree(x)
|
f(...,C,...,x,...)
|
*f(...,x,...)
|
*x->f
)
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>