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lz4: ensure length does not wrap 

Note: this is the same as 206204a1162b995e2185275167b22468c00d6b36 in
linux-git.

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: Holger Schurig <holgerschurig@gmail.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
This commit is contained in:
Holger Schurig 2014-07-01 23:22:05 +02:00 committed by Sascha Hauer
parent ecb1dc0b1e
commit 918782bb0f
1 changed files with 2 additions and 0 deletions
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2
lib/lz4/lz4_decompress.c
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@ -73,6 +73,8 @@ 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;
}