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ARM: 7913/1: fix framepointer check in unwind_frame 

commit 3abb6671a9c04479c4bd026798a05f857393b7e2 upstream.

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

Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@samsung.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Konstantin Khlebnikov 2013-12-05 14:23:48 +01:00 committed by Greg Kroah-Hartman
parent fa2ea62aeb
commit 47131c7c78
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); high = ALIGN(low, THREAD_SIZE);
/* check current frame pointer is within bounds */ /* check current frame pointer is within bounds */
if (fp < (low + 12) || fp + 4 >= high) if (fp < low + 12 || fp > high - 4)
return -EINVAL; return -EINVAL;
/* restore the registers from the stack frame */ /* restore the registers from the stack frame */