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Message-Id: <20140624154955.023232981@linuxfoundation.org> Date: Tue, 24 Jun 2014 11:51:32 -0400 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, "Don A. Bailey" <donb@...uritymouse.com> Subject: [PATCH 3.15 49/61] lz4: ensure length does not wrap 3.15-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> --- lib/lz4/lz4_decompress.c | 2 ++ 1 file changed, 2 insertions(+) --- a/lib/lz4/lz4_decompress.c +++ b/lib/lz4/lz4_decompress.c @@ -72,6 +72,8 @@ static int lz4_uncompress(const char *so len = *ip++; for (; len == 255; length += 255) len = *ip++; + if (unlikely(length > (size_t)(length + len))) + goto _output_error; length += len; } -- 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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