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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: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Stephan Mueller 2016-12-01 08:22:37 +01:00 committed by Herbert Xu
parent efad2b61ae
commit 5937d81a96
1 changed files with 3 additions and 2 deletions
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5
crypto/algif_aead.c
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@ -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);