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[S390] kprobes: add parameter check to module_free()

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When unregistering kprobes, kprobes calls module_free() and
always passes NULL for the mod parameter.  Add a check to
prevent NULL pointer dereferences.

See commit 740a8de0796dd12890b3c8ddcfabfcb528b78d40 for more details.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Hendrik Brueckner 2010-06-08 18:58:10 +02:00 committed by Martin Schwidefsky
parent c2f0e8c803
commit 3164a3cbf8
1 changed files with 4 additions and 2 deletions
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6
arch/s390/kernel/module.c
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@ -55,8 +55,10 @@ void *module_alloc(unsigned long size)
/* Free memory returned from module_alloc */
void module_free(struct module *mod, void *module_region)
{
vfree(mod->arch.syminfo);
mod->arch.syminfo = NULL;
if (mod) {
vfree(mod->arch.syminfo);
mod->arch.syminfo = NULL;
}
vfree(module_region);
}