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Commit 5937d81a authored by Stephan Mueller's avatar Stephan Mueller Committed by Herbert Xu
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crypto: algif_aead - fix AIO handling of zero buffer 



Handle the case when the caller provided a zero buffer to
sendmsg/sendpage. Such scenario is legal for AEAD ciphers when no
plaintext / ciphertext and no AAD is provided and the caller only
requests the generation of the tag value.

Signed-off-by: default avatarStephan Mueller <smueller@chronox.de>
Signed-off-by: default avatarHerbert Xu <herbert@gondor.apana.org.au>
parent efad2b61

crypto/algif_aead.c

+3 −2
Original line number Diff line number Diff line
@@ -448,12 +448,13 @@ static int aead_recvmsg_async(struct socket *sock, struct msghdr *msg, 
	used -= ctx->aead_assoclen + (ctx->enc ? as : 0);



	/* take over all tx sgls from ctx */

	areq->tsgl = sock_kmalloc(sk, sizeof(*areq->tsgl) * sgl->cur,

	areq->tsgl = sock_kmalloc(sk,

				  sizeof(*areq->tsgl) * max_t(u32, sgl->cur, 1),

				  GFP_KERNEL);

	if (unlikely(!areq->tsgl))

		goto free;



	sg_init_table(areq->tsgl, sgl->cur);

	sg_init_table(areq->tsgl, max_t(u32, sgl->cur, 1));

	for (i = 0; i < sgl->cur; i++)

		sg_set_page(&areq->tsgl[i], sg_page(&sgl->sg[i]),

			    sgl->sg[i].length, sgl->sg[i].offset);