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Illumos #4936 fix potential overflow in lz4

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4936 lz4 could theoretically overflow a pointer with a certain input
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>
Reviewed by: Keith Wesolowski <keith.wesolowski@joyent.com>
Approved by: Gordon Ross <gordon.ross@nexenta.com>
Ported by: Tim Chase <tim@chase2k.com>

References:
  https://illumos.org/issues/4936
  https://github.com/illumos/illumos-gate/commit/58d0718

Porting notes:

This fixes the widely-reported "20-year-old vulnerability" in
LZO/LZ4 implementations which inherited said bug from the reference
implementation.

Signed-off-by: Richard Yao <ryao@gentoo.org>
Signed-off-by: Tim Chase <tim@chase2k.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #2429
This commit is contained in:
Dan McDonald 2014-06-23 22:25:02 -04:00 committed by Brian Behlendorf
parent 4240dc332d
commit ee4712284c
1 changed files with 3 additions and 0 deletions
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3
module/zfs/lz4.c
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@ -907,6 +907,9 @@ LZ4_uncompress_unknownOutputSize(const char *source, char *dest, int isize,
} }
/* copy literals */ /* copy literals */
cpy = op + length; cpy = op + length;
/* CORNER-CASE: cpy might overflow. */
if (cpy < op)
goto _output_error; /* cpy was overflowed, bail! */
if ((cpy > oend - COPYLENGTH) || if ((cpy > oend - COPYLENGTH) ||
(ip + length > iend - COPYLENGTH)) { (ip + length > iend - COPYLENGTH)) {
if (cpy > oend) if (cpy > oend)