From: Herbert Xu Date: Tue, 13 Sep 2016 06:43:29 +0000 (+0800) Subject: crypto: skcipher - Fix blkcipher walk OOM crash X-Git-Tag: firefly_0821_release~176^2~4^2~27^2~63 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=1c95a8a481efa5716b847b75f9c8b26f65844362;p=firefly-linux-kernel-4.4.55.git crypto: skcipher - Fix blkcipher walk OOM crash commit acdb04d0b36769b3e05990c488dc74d8b7ac8060 upstream. When we need to allocate a temporary blkcipher_walk_next and it fails, the code is supposed to take the slow path of processing the data block by block. However, due to an unrelated change we instead end up dereferencing the NULL pointer. This patch fixes it by moving the unrelated bsize setting out of the way so that we enter the slow path as inteded. Fixes: 7607bd8ff03b ("[CRYPTO] blkcipher: Added blkcipher_walk_virt_block") Reported-by: xiakaixu Reported-by: Ard Biesheuvel Signed-off-by: Herbert Xu Tested-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c index 8cc1622b2ee0..dca7bc87dad9 100644 --- a/crypto/blkcipher.c +++ b/crypto/blkcipher.c @@ -234,6 +234,8 @@ static int blkcipher_walk_next(struct blkcipher_desc *desc, return blkcipher_walk_done(desc, walk, -EINVAL); } + bsize = min(walk->walk_blocksize, n); + walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY | BLKCIPHER_WALK_DIFF); if (!scatterwalk_aligned(&walk->in, walk->alignmask) || @@ -246,7 +248,6 @@ static int blkcipher_walk_next(struct blkcipher_desc *desc, } } - bsize = min(walk->walk_blocksize, n); n = scatterwalk_clamp(&walk->in, n); n = scatterwalk_clamp(&walk->out, n);