[PATCH] arm64: Don't call NULL in do_compat_alignment_fixup

[Angelos Oikonomopoulos]

do_alignment_t32_to_handler only fixes up alignment faults for specific
instructions; it returns NULL otherwise. When that's the case, signal to
the caller that it needs to proceed with the regular alignment fault
handling (i.e. SIGBUS).

Signed-off-by: Angelos Oikonomopoulos <angelos at igalia.com>
---
 arch/arm64/kernel/compat_alignment.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/compat_alignment.c b/arch/arm64/kernel/compat_alignment.c
index deff21bfa680..76cf1c1b5bc6 100644
--- a/arch/arm64/kernel/compat_alignment.c
+++ b/arch/arm64/kernel/compat_alignment.c
@@ -34,7 +34,7 @@
 
 #define REGMASK_BITS(i)	(i & 0xffff)
 
-#define BAD_INSTR 	0xdeadc0de
+#define BAD_INSTR	0xdeadc0de
 
 /* Thumb-2 32 bit format per ARMv7 DDI0406A A6.3, either f800h,e800h,f800h */
 #define IS_T32(hi16) \
@@ -368,6 +368,8 @@ int do_compat_alignment_fixup(unsigned long addr, struct pt_regs *regs)
 		return 1;
 	}
 
+	if (!handler)
+		return 1;
 	type = handler(addr, instr, regs);
 
 	if (type == TYPE_ERROR || type == TYPE_FAULT)
-- 
2.49.0