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authorEric Biggers <ebiggers@google.com>2019-04-09 23:46:32 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2019-04-18 22:14:58 +0800
commit4a8108b70508df0b6c4ffa4a3974dab93dcbe851 (patch)
tree541d1c7daad8179310c43e7faf0b59cf08446379
parent767f015ea0b7ab9d60432ff6cd06b664fd71f50f (diff)
crypto: arm64/aes-neonbs - don't access already-freed walk.iv
If the user-provided IV needs to be aligned to the algorithm's alignmask, then skcipher_walk_virt() copies the IV into a new aligned buffer walk.iv. But skcipher_walk_virt() can fail afterwards, and then if the caller unconditionally accesses walk.iv, it's a use-after-free. xts-aes-neonbs doesn't set an alignmask, so currently it isn't affected by this despite unconditionally accessing walk.iv. However this is more subtle than desired, and unconditionally accessing walk.iv has caused a real problem in other algorithms. Thus, update xts-aes-neonbs to start checking the return value of skcipher_walk_virt(). Fixes: 1abee99eafab ("crypto: arm64/aes - reimplement bit-sliced ARM/NEON implementation for arm64") Cc: <stable@vger.kernel.org> # v4.11+ Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
-rw-r--r--arch/arm64/crypto/aes-neonbs-glue.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm64/crypto/aes-neonbs-glue.c b/arch/arm64/crypto/aes-neonbs-glue.c
index 4737b6c6c5cf..514455117733 100644
--- a/arch/arm64/crypto/aes-neonbs-glue.c
+++ b/arch/arm64/crypto/aes-neonbs-glue.c
@@ -304,6 +304,8 @@ static int __xts_crypt(struct skcipher_request *req,
int err;
err = skcipher_walk_virt(&walk, req, false);
+ if (err)
+ return err;
kernel_neon_begin();
neon_aes_ecb_encrypt(walk.iv, walk.iv, ctx->twkey, ctx->key.rounds, 1);