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crypto: xts - Fix atomic sleep when walking skcipher 

When we perform a walk in the completion function, we need to ensure
that it is atomic.

Reported-by: syzbot+6f72c20560060c98b566@syzkaller.appspotmail.com
Fixes: 78105c7e76 ("crypto: xts - Drop use of auxiliary buffer")
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Acked-by: Ondrej Mosnacek <omosnace@redhat.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2019-04-15 14:35:19 +08:00
parent 678cce4019
commit 44427c0fbc
1 changed files with 5 additions and 1 deletions
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6
crypto/xts.c
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@ -137,8 +137,12 @@ static void crypt_done(struct crypto_async_request *areq, int err)
{ {
struct skcipher_request *req = areq->data; struct skcipher_request *req = areq->data;
if (!err) if (!err) {
struct rctx *rctx = skcipher_request_ctx(req);
rctx->subreq.base.flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
err = xor_tweak_post(req); err = xor_tweak_post(req);
}
skcipher_request_complete(req, err); skcipher_request_complete(req, err);
} }