fscache_cookie_enabled: check cookie is valid before accessing it
commit 0dc54bd4 upstream. fscache_cookie_enabled() could be called on NULL cookies and cause a null pointer dereference when accessing cookie flags: just make sure the cookie is valid first Suggested-by:David Howells <dhowells@redhat.com> Acked-by:
David Howells <dhowells@redhat.com> Signed-off-by:
Dominique Martinet <asmadeus@codewreck.org> Cc: Jeffrey E Altman <jaltman@auristor.com> Signed-off-by:
Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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