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crypto: af_alg - rewrite NULL pointer check

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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@iscas.ac.cn>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Jiasheng Jiang 2021-12-31 09:40:36 +08:00 committed by Herbert Xu
parent dd827abe29
commit 5f21d7d283
1 changed files with 5 additions and 2 deletions
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7
crypto/af_alg.c
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@ -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) {