Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 3.14 59/68] lz4: ensure length does not wrap | Date | Tue, 24 Jun 2014 11:51:18 -0400 |
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3.14-stable review patch. If anyone has any objections, please let me know.
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From: Greg Kroah-Hartman <gregkh@linuxfoundation.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@securitymouse.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.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; }
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