3.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Michael Neuling <mikey@xxxxxxxxxxx>
commit c2fd22df89365df9451d5b91da3b7bfd48122ecd upstream.
Make sure that current->thread.reg exists before we deference it in
flush_hash_page.
Signed-off-by: Michael Neuling <mikey@xxxxxxxxxxx>
Reported-by: John J Miller <millerjo@xxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/hash_utils_64.c | 1 +
1 file changed, 1 insertion(+)
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -1191,6 +1191,7 @@ void flush_hash_page(unsigned long vpn,
* 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);
--
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