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[S390] kprobes: add parameter check to module_free()
authorHendrik Brueckner <brueckner@linux.vnet.ibm.com>
Tue, 8 Jun 2010 16:58:10 +0000 (18:58 +0200)
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>
Tue, 8 Jun 2010 16:58:23 +0000 (18:58 +0200)
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>

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