gdth: Prevent negative offsets in ioctl CVE-2009-3080
commit 690e7448 upstream. A negative offset could be used to index before the event buffer and lead to a security breach. Signed-off-by: Dave Jones <davej@redhat.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
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