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authorEric Biggers <ebiggers@google.com>2019-04-09 23:46:30 -0700
committerHerbert Xu <herbert@gondor.apana.org.au>2019-04-18 22:14:58 +0800
commitedaf28e996af69222b2cb40455dbb5459c2b875a (patch)
tree29bb259e0d67981a052a486930977d0f43f9647d /crypto
parentaec286cd36eacfd797e3d5dab8d5d23c15d1bb5e (diff)
downloadlinux-edaf28e996af69222b2cb40455dbb5459c2b875a.tar.bz2
crypto: salsa20 - 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. 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>
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 443fba09cbed..faed244be316 100644
--- a/crypto/salsa20_generic.c
+++ b/crypto/salsa20_generic.c
@@ -160,7 +160,7 @@ static int salsa20_crypt(struct skcipher_request *req)
err = skcipher_walk_virt(&walk, req, false);
- salsa20_init(state, ctx, walk.iv);
+ salsa20_init(state, ctx, req->iv);
while (walk.nbytes > 0) {
unsigned int nbytes = walk.nbytes;