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ARM: 7913/1: fix framepointer check in unwind_frame

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This patch fixes corner case when (fp + 4) overflows unsigned long,
for example: fp = 0xFFFFFFFF -> fp + 4 == 3.

Cc: <stable@vger.kernel.org>
Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Konstantin Khlebnikov 2013-12-05 14:23:48 +01:00 committed by Russell King
parent 1b15ec7a74
commit 3abb6671a9
1 changed files with 1 additions and 1 deletions
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arch/arm/kernel/stacktrace.c
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@ -31,7 +31,7 @@ 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 */