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crypto: cryptd - Use correct tfm object for AEAD tracking 

The AEAD code path incorrectly uses the child tfm to track the
cryptd refcnt, and then potentially frees the child tfm.

Fixes: 81760ea6a9 ("crypto: cryptd - Add helpers to check...")
Reported-by: Sowmini Varadhan <sowmini.varadhan@oracle.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Herbert Xu 2016-08-25 16:49:51 +08:00
parent 901d3d4fee
commit 31bd44e768
1 changed files with 2 additions and 1 deletions
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3
crypto/cryptd.c
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@ -733,13 +733,14 @@ static void cryptd_aead_crypt(struct aead_request *req,
rctx = aead_request_ctx(req); rctx = aead_request_ctx(req);
compl = rctx->complete; compl = rctx->complete;
tfm = crypto_aead_reqtfm(req);
if (unlikely(err == -EINPROGRESS)) if (unlikely(err == -EINPROGRESS))
goto out; goto out;
aead_request_set_tfm(req, child); aead_request_set_tfm(req, child);
err = crypt( req ); err = crypt( req );
out: out:
tfm = crypto_aead_reqtfm(req);
ctx = crypto_aead_ctx(tfm); ctx = crypto_aead_ctx(tfm);
refcnt = atomic_read(&ctx->refcnt); refcnt = atomic_read(&ctx->refcnt);