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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>
This commit is contained in:
Michael Neuling 2013-05-02 15:36:14 +00:00 committed by Benjamin Herrenschmidt
parent c4463b3738
commit c2fd22df89
1 changed files with 1 additions and 0 deletions
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arch/powerpc/mm/hash_utils_64.c
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@ -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);