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authorEric Biggers <ebiggers@google.com>2019-04-09 23:46:30 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2019-05-21 18:49:00 +0200
commit91078439cc1c5c2f061cf7bac465ccf203933e84 (patch)
tree3182170195a0ebdf7bc69dc0bcb0b9468c8a3cf5 /crypto
parent62d629a5a9577546ce74db68de69863f04b99f3a (diff)
crypto: salsa20 - don't access already-freed walk.iv
commit edaf28e996af69222b2cb40455dbb5459c2b875a upstream. 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. salsa20-generic 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 it was actually broken prior to the alignmask being removed by commit b62b3db76f73 ("crypto: salsa20-generic - cleanup and convert to skcipher API"). Since salsa20-generic does not update the IV and does not need any IV alignment, update it to use req->iv instead of walk.iv. Fixes: 2407d60872dd ("[CRYPTO] salsa20: Salsa20 stream cipher") Cc: stable@vger.kernel.org Signed-off-by: Eric Biggers <ebiggers@google.com> Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'crypto')
-rw-r--r--crypto/salsa20_generic.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/crypto/salsa20_generic.c b/crypto/salsa20_generic.c
index d7da0eea5622..319d9962552e 100644
--- a/crypto/salsa20_generic.c
+++ b/crypto/salsa20_generic.c
@@ -186,7 +186,7 @@ static int encrypt(struct blkcipher_desc *desc,
blkcipher_walk_init(&walk, dst, src, nbytes);
err = blkcipher_walk_virt_block(desc, &walk, 64);
- salsa20_ivsetup(ctx, walk.iv);
+ salsa20_ivsetup(ctx, desc->info);
while (walk.nbytes >= 64) {
salsa20_encrypt_bytes(ctx, walk.dst.virt.addr,