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| author | Herbert Xu <herbert@gondor.apana.org.au> | 2016-09-13 14:43:29 +0800 |
|---|---|---|
| committer | Ben Hutchings <ben@decadent.org.uk> | 2016-11-20 01:01:38 +0000 |
| commit | 87f3c8956e3fea2a704c3834e0666e8fae5a529e (patch) | |
| tree | 928a8d841cfc9b2848695669b92c98082f4abd01 | |
| parent | b9590db438694507e4460abaff3340483bdcd7d7 (diff) | |
| download | lwn-87f3c8956e3fea2a704c3834e0666e8fae5a529e.tar.gz lwn-87f3c8956e3fea2a704c3834e0666e8fae5a529e.zip | |
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 <xiakaixu@huawei.com>
Reported-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
[bwh: Backported to 3.2: s/walk_blocksize/blocksize/]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
| -rw-r--r-- | crypto/blkcipher.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/crypto/blkcipher.c b/crypto/blkcipher.c index 7b69d7a902a9..a5284e0a523d 100644 --- a/crypto/blkcipher.c +++ b/crypto/blkcipher.c @@ -238,6 +238,8 @@ static int blkcipher_walk_next(struct blkcipher_desc *desc, return blkcipher_walk_done(desc, walk, -EINVAL); } + bsize = min(walk->blocksize, n); + walk->flags &= ~(BLKCIPHER_WALK_SLOW | BLKCIPHER_WALK_COPY | BLKCIPHER_WALK_DIFF); if (!scatterwalk_aligned(&walk->in, alignmask) || @@ -250,7 +252,6 @@ static int blkcipher_walk_next(struct blkcipher_desc *desc, } } - bsize = min(walk->blocksize, n); n = scatterwalk_clamp(&walk->in, n); n = scatterwalk_clamp(&walk->out, n); |