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crypto: algif_skcipher - Cap recv SG list at ctx->used

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commit 7cf8195470 upstream.

Somewhere along the line the cap on the SG list length for receive
was lost.  This patch restores it and removes the subsequent test
which is now redundant.

Fixes: 2d97591ef4 ("crypto: af_alg - consolidation of...")
Cc: <stable@vger.kernel.org>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Reviewed-by: Stephan Mueller <smueller@chronox.de>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Herbert Xu 2020-05-29 14:54:43 +10:00 • committed by Greg Kroah-Hartman
commit b3ad0cdbdc
1 changed files with 1 additions and 5 deletions
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6
crypto/algif_skcipher.c
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@ -78,14 +78,10 @@ static int _skcipher_recvmsg(struct socket *sock, struct msghdr *msg,
return PTR_ERR(areq);
/* convert iovecs of output buffers into RX SGL */
err = af_alg_get_rsgl(sk, msg, flags, areq, -1, &len);
err = af_alg_get_rsgl(sk, msg, flags, areq, ctx->used, &len);
if (err)
goto free;
/* Process only as much RX buffers for which we have TX data */
if (len > ctx->used)
len = ctx->used;
/*
* If more buffers are to be expected to be processed, process only
* full block size buffers.