Commit 0640eeea authored by Gilad Ben-Yossef's avatar Gilad Ben-Yossef Committed by Greg Kroah-Hartman

crypto: gcm - wait for crypto op not signal safe

commit f3ad5870 upstream.

crypto_gcm_setkey() was using wait_for_completion_interruptible() to
wait for completion of async crypto op but if a signal occurs it
may return before DMA ops of HW crypto provider finish, thus
corrupting the data buffer that is kfree'ed in this case.

Resolve this by using wait_for_completion() instead.
Reported-by: default avatarEric Biggers <ebiggers3@gmail.com>
Signed-off-by: default avatarGilad Ben-Yossef <gilad@benyossef.com>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 45771cd7
......@@ -146,10 +146,8 @@ static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
err = crypto_ablkcipher_encrypt(&data->req);
if (err == -EINPROGRESS || err == -EBUSY) {
err = wait_for_completion_interruptible(
&data->result.completion);
if (!err)
err = data->result.err;
wait_for_completion(&data->result.completion);
err = data->result.err;
}
if (err)
......
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