linux-kernel - [PATCH 2/2] ARM64: fix framepointer check in unwind

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Message-id: <20131205133016.16410.42062.stgit@buzz>
Date:	Thu, 05 Dec 2013 17:30:16 +0400
From:	Konstantin Khlebnikov <k.khlebnikov@...sung.com>
To:	Catalin Marinas <catalin.marinas@....com>,
	Will Deacon <will.deacon@....com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH 2/2] ARM64: fix framepointer check in unwind_frame

We need at least 24 bytes above frame pointer.

Signed-off-by: Konstantin Khlebnikov <k.khlebnikov@...sung.com>
---
 arch/arm64/kernel/stacktrace.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/arm64/kernel/stacktrace.c b/arch/arm64/kernel/stacktrace.c
index d25459f..c3b6c63 100644
--- a/arch/arm64/kernel/stacktrace.c
+++ b/arch/arm64/kernel/stacktrace.c
@@ -43,7 +43,7 @@ int unwind_frame(struct stackframe *frame)
 	low  = frame->sp;
 	high = ALIGN(low, THREAD_SIZE);
 
-	if (fp < low || fp > high || fp & 0xf)
+	if (fp < low || fp > high - 0x18 || fp & 0xf)
 		return -EINVAL;
 
 	frame->sp = fp + 0x10;

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