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Message-Id: <1406195177-8656-27-git-send-email-luis.henriques@canonical.com> Date: Thu, 24 Jul 2014 10:44:35 +0100 From: Luis Henriques <luis.henriques@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, Luis Henriques <luis.henriques@...onical.com> Subject: [PATCH 3.11 026/128] lz4: ensure length does not wrap 3.11.10.14 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> commit 206204a1162b995e2185275167b22468c00d6b36 upstream. Given some pathologically compressed data, lz4 could possibly decide to wrap a few internal variables, causing unknown things to happen. Catch this before the wrapping happens and abort the decompression. Reported-by: "Don A. Bailey" <donb@...uritymouse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Signed-off-by: Luis Henriques <luis.henriques@...onical.com> --- lib/lz4/lz4_decompress.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c index 411be80ddb46..6423f018f907 100644 --- a/lib/lz4/lz4_decompress.c +++ b/lib/lz4/lz4_decompress.c @@ -72,6 +72,8 @@ static int lz4_uncompress(const char *source, char *dest, int osize) len = *ip++; for (; len == 255; length += 255) len = *ip++; + if (unlikely(length > (size_t)(length + len))) + goto _output_error; length += len; } -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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