@@ -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,
This is a note to let you know that I have just added a patch titled lz4: fix another possible overrun to the linux-3.11.y-queue branch of the 3.11.y.z extended stable tree which can be found at: http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.11.y-queue If you, or anyone else, feels it should not be added to this tree, please reply to this email. For more information about the 3.11.y.z tree, see https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable Thanks. -Luis ------ From 5a05e9855da46131cd0ed34b29045636bf479d87 Mon Sep 17 00:00:00 2001 From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Date: Tue, 24 Jun 2014 16:59:01 -0400 Subject: lz4: fix another possible overrun commit 4148c1f67abf823099b2d7db6851e4aea407f5ee upstream. 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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Signed-off-by: Luis Henriques <luis.henriques@canonical.com> --- lib/lz4/lz4_decompress.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) -- 1.9.1