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lz4: ensure length does not wrap

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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>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Greg Kroah-Hartman 2014-06-20 22:01:41 -07:00
parent 206a81c184
commit 206204a116
1 changed files with 2 additions and 0 deletions
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2
lib/lz4/lz4_decompress.c
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@ -72,6 +72,8 @@ static int lz4_uncompress(const char *source, char *dest, int osize)
len = *ip++; len = *ip++;
for (; len == 255; length += 255) for (; len == 255; length += 255)
len = *ip++; len = *ip++;
if (unlikely(length > (size_t)(length + len)))
goto _output_error;
length += len; length += len;
} }