Commit 4148c1f6 authored Jun 24, 2014 by Greg Kroah-Hartman

lz4: fix another possible overrun



There is one other possible overrun in the lz4 code as implemented by
Linux at this point in time (which differs from the upstream lz4
codebase, but will get synced at in a future kernel release.)  As
pointed out by Don, we also need to check the overflow in the data
itself.

While we are at it, replace the odd error return value with just a
"simple" -1 value as the return value is never used for anything other
than a basic "did this work or not" check.

Reported-by: "Don A. Bailey" <donb@securitymouse.com>
Reported-by: Willy Tarreau <w@1wt.eu>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

parent 206204a1

lib/lz4/lz4_decompress.c

+3 −1

Original line number	Diff line number	Diff line
		@@ -108,6 +108,8 @@ static int lz4_uncompress(const char source, char dest, int osize)
		if (length == ML_MASK) {
		for (; *ip == 255; length += 255)
		ip++;
		if (unlikely(length > (size_t)(length + *ip)))
		goto _output_error;
		length += *ip++;
		}

		@@ -157,7 +159,7 @@ static int lz4_uncompress(const char source, char dest, int osize)

		/* write overflow error detected */
		_output_error:
		return (int) (-(((char *)ip) - source));
		return -1;
		}

		static int lz4_uncompress_unknownoutputsize(const char source, char dest,

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