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Date: Mon, 21 Nov 2011 18:51:19 +0100
From: Petr Matousek <>
Subject: CVE-2011-4110 kernel: keys: NULL pointer deref in the user-defined
 key type

There is a NULL pointer deref in the user-defined key type whereby
updating a negative key into a fully instantiated key will cause
an oops to occur when the code attempts to free the non-existent
old payload.

Upstream commit:


Petr Matousek / Red Hat Security Response Team

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