This patch fixes corner case when (fp + 4) overflows unsigned long,
for example: fp = 0xFFFFFFFF -> fp + 4 == 3.
Copy from commit 3abb6671a9c0 ("ARM: 7913/1: fix framepointer check in
unwind_frame").
Signed-off-by: Young Xiao <92siuy...@gmail.com>
---
arch/unicore32/kernel/stacktrace.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/unicore32/kernel/stacktrace.c
b/arch/unicore32/kernel/stacktrace.c
index e37da8c..8e5d12e 100644
--- a/arch/unicore32/kernel/stacktrace.c
+++ b/arch/unicore32/kernel/stacktrace.c
@@ -43,7 +43,7 @@ int notrace unwind_frame(struct stackframe *frame)
high = ALIGN(low, THREAD_SIZE);
/* check current frame pointer is within bounds */
- if (fp < (low + 12) || fp + 4 >= high)
+ if (fp < low + 12 || fp > high - 4)
return -EINVAL;
/* restore the registers from the stack frame */
--
2.7.4
