From 2fd41cac1992488b81c8c80429a65b3a03091e72 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman Date: Fri, 20 Jun 2014 22:01:41 -0700 Subject: [PATCH] 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" Cc: stable Signed-off-by: Greg Kroah-Hartman --- lib/lz4/lz4_decompress.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/lib/lz4/lz4_decompress.c b/lib/lz4/lz4_decompress.c index df6839e3ce088..99a03acb7d470 100644 --- a/lib/lz4/lz4_decompress.c +++ b/lib/lz4/lz4_decompress.c @@ -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; } -- 2.39.5