commit: c2fd22df89365df9451d5b91da3b7bfd48122ecd
From: Michael Neuling <mikey@xxxxxxxxxxx>
Date: Thu, 2 May 2013 15:36:14 +0000
Subject: 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@xxxxxxxxxxx>
Reported-by: John J Miller <millerjo@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>
---
arch/powerpc/mm/hash_utils_64.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/powerpc/mm/hash_utils_64.c b/arch/powerpc/mm/hash_utils_64.c
index 3e4c4ed..88ac0ee 100644
--- a/arch/powerpc/mm/hash_utils_64.c
+++ b/arch/powerpc/mm/hash_utils_64.c
@@ -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);
--
1.7.10.4
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