[PATCH] powerpc/tm: Fix null pointer deference in flush_hash_page
From: Michael Neuling <hidden>
Date: 2013-05-03 01:36:14
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
Make sure that current->thread.reg exists before we deference it in flush_hash_page. Signed-off-by: Michael Neuling <redacted> Reported-by: John J Miller <redacted> Cc: <redacted>
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);