From: Pan Bian Subject: [PATCH 1/1] crypto: set error code when kcalloc fails Date: Thu, 1 Dec 2016 10:04:43 +0800 Message-ID: <1480557883-18844-1-git-send-email-bianpan2016@163.com> Cc: linux-crypto@vger.kernel.org, linux-kernel@vger.kernel.org, Pan Bian To: Herbert Xu , "David S. Miller" Return-path: Received: from m12-13.163.com ([220.181.12.13]:41515 "EHLO m12-13.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754978AbcLACWS (ORCPT ); Wed, 30 Nov 2016 21:22:18 -0500 Sender: linux-crypto-owner@vger.kernel.org List-ID: Fix bug https://bugzilla.kernel.org/show_bug.cgi?id=188521. In function skcipher_recvmsg_async(), variable err takes the return value, and its value should be negative on failures. Because variable err may be reassigned and checked before calling kcalloc(), its value may be 0 (indicates no error) even if kcalloc() fails. This patch fixes the bug by explicitly assigning -ENOMEM to err when kcalloc() returns a NULL pointer. Signed-off-by: Pan Bian --- crypto/algif_skcipher.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/crypto/algif_skcipher.c b/crypto/algif_skcipher.c index 28556fc..bfb0a1a 100644 --- a/crypto/algif_skcipher.c +++ b/crypto/algif_skcipher.c @@ -566,8 +566,10 @@ static int skcipher_recvmsg_async(struct socket *sock, struct msghdr *msg, * need to expand */ tmp = kcalloc(tx_nents * 2, sizeof(*tmp), GFP_KERNEL); - if (!tmp) + if (!tmp) { + err = -ENOMEM; goto free; + } sg_init_table(tmp, tx_nents * 2); for (x = 0; x < tx_nents; x++) -- 1.9.1