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From: (Russell King)
Subject: [PATCH 4/8] kexec: ensure user memory sizes do not wrap
Date: Fri, 03 Jun 2016 09:50:27 +0100
Message-ID: <> (raw)

Ensure that user memory sizes do not wrap around when validating the
user input, which can lead to the following input validation working

Acked-by: Baoquan He <>
Reviewed-by: Pratyush Anand <>
Signed-off-by: Russell King <>
 kernel/kexec_core.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/kexec_core.c b/kernel/kexec_core.c
index 8d34308ea449..d719a4d0ef55 100644
--- a/kernel/kexec_core.c
+++ b/kernel/kexec_core.c
@@ -169,6 +169,8 @@ int sanity_check_segment_list(struct kimage *image)
 		mstart = image->segment[i].mem;
 		mend   = mstart + image->segment[i].memsz;
+		if (mstart > mend)
+			return result;
 		if ((mstart & ~PAGE_MASK) || (mend & ~PAGE_MASK))
 			return result;

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