linux-kernel - [PATCH v2] crypto: af_alg - check possible NULL pointer

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Message-Id: <20211231014036.1870631-1-jiasheng@iscas.ac.cn>
Date:   Fri, 31 Dec 2021 09:40:36 +0800
From:   Jiasheng Jiang <jiasheng@...as.ac.cn>
To:     ebiggers@...nel.org, herbert@...dor.apana.org.au,
        davem@...emloft.net
Cc:     linux-crypto@...r.kernel.org, linux-kernel@...r.kernel.org,
        Jiasheng Jiang <jiasheng@...as.ac.cn>
Subject: [PATCH v2] crypto: af_alg - check possible NULL pointer

Because of the possible alloc failure of the alloc_page(), it could
return NULL pointer.
And there is a check below the sg_assign_page().
But it will be more logical to move the NULL check before the
sg_assign_page().

Signed-off-by: Jiasheng Jiang <jiasheng@...as.ac.cn>
---
Changelog:

v1 -> v2

* Change 1. Move the previous check in front of sg_assign_page().
---
 crypto/af_alg.c | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/crypto/af_alg.c b/crypto/af_alg.c
index 18cc82dc4a42..f79e446d8132 100644
--- a/crypto/af_alg.c
+++ b/crypto/af_alg.c
@@ -931,16 +931,19 @@ int af_alg_sendmsg(struct socket *sock, struct msghdr *msg, size_t size,
 			sg_unmark_end(sg + sgl->cur - 1);
 
 		do {
+			struct page *pg;
 			unsigned int i = sgl->cur;
 
 			plen = min_t(size_t, len, PAGE_SIZE);
 
-			sg_assign_page(sg + i, alloc_page(GFP_KERNEL));
-			if (!sg_page(sg + i)) {
+			pg = alloc_page(GFP_KERNEL);
+			if (!pg) {
 				err = -ENOMEM;
 				goto unlock;
 			}
 
+			sg_assign_page(sg + i, pg);
+
 			err = memcpy_from_msg(page_address(sg_page(sg + i)),
 					      msg, plen);
 			if (err) {
-- 
2.25.1