Commit 206204a1 authored Jun 20, 2014 by Greg Kroah-Hartman

lz4: ensure length does not wrap



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>

parent 206a81c1

lib/lz4/lz4_decompress.c

+2 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}