From: Herbert Xu herbert@gondor.apana.org.au
[ Upstream commit b5a772adf45a32c68bef28e60621f12617161556 ]
As it is essiv only handles the special return value of EINPROGERSS, which means that in all other cases it will free data related to the request.
However, as the caller of essiv may specify MAY_BACKLOG, we also need to expect EBUSY and treat it in the same way. Otherwise backlogged requests will trigger a use-after-free.
Fixes: be1eb7f78aa8 ("crypto: essiv - create wrapper template...") Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Acked-by: Ard Biesheuvel ardb@kernel.org Signed-off-by: Herbert Xu herbert@gondor.apana.org.au Signed-off-by: Sasha Levin sashal@kernel.org --- crypto/essiv.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/crypto/essiv.c b/crypto/essiv.c index e33369df90344..307eba74b901e 100644 --- a/crypto/essiv.c +++ b/crypto/essiv.c @@ -171,7 +171,12 @@ static void essiv_aead_done(struct crypto_async_request *areq, int err) struct aead_request *req = areq->data; struct essiv_aead_request_ctx *rctx = aead_request_ctx(req);
+ if (err == -EINPROGRESS) + goto out; + kfree(rctx->assoc); + +out: aead_request_complete(req, err); }
@@ -247,7 +252,7 @@ static int essiv_aead_crypt(struct aead_request *req, bool enc) err = enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
- if (rctx->assoc && err != -EINPROGRESS) + if (rctx->assoc && err != -EINPROGRESS && err != -EBUSY) kfree(rctx->assoc); return err; }