Commit c2fd22df authored May 02, 2013 by Michael Neuling Committed by Benjamin Herrenschmidt May 06, 2013

powerpc/tm: Fix null pointer deference in flush_hash_page



Make sure that current->thread.reg exists before we deference it in
flush_hash_page.

Signed-off-by: Michael Neuling <mikey@neuling.org>
Reported-by: John J Miller <millerjo@us.ibm.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

parent c4463b37

arch/powerpc/mm/hash_utils_64.c

+1 −0

Original line number	Diff line number	Diff line
		@@ -1230,6 +1230,7 @@ void flush_hash_page(unsigned long vpn, real_pte_t pte, int psize, int ssize,
		* unmapping it first, it may see the speculated version.
		*/
		if (local && cpu_has_feature(CPU_FTR_TM) &&
		current->thread.regs &&
		MSR_TM_ACTIVE(current->thread.regs->msr)) {
		tm_enable();
		tm_abort(TM_CAUSE_TLBI);