linux-kernel - [PATCH] libceph: check pointer before assigned to "c->rules[]"

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Date:   Tue, 14 Jun 2022 15:10:59 +0800
From:   Li Qiong <liqiong@...china.com>
To:     Ilya Dryomov <idryomov@...il.com>, Xiubo Li <xiubli@...hat.com>,
        Jeff Layton <jlayton@...nel.org>,
        "David S . Miller" <davem@...emloft.net>,
        Eric Dumazet <edumazet@...gle.com>,
        Jakub Kicinski <kuba@...nel.org>,
        Paolo Abeni <pabeni@...hat.com>
Cc:     ceph-devel@...r.kernel.org, linux-kernel@...r.kernel.org,
        yuzhe@...china.com, renyu@...china.com,
        Li Qiong <liqiong@...china.com>
Subject: [PATCH] libceph: check pointer before assigned to "c->rules[]"

It should be better to check pointer firstly, then assign it
to c->rules[]. Refine code a little bit.

Signed-off-by: Li Qiong <liqiong@...china.com>
---
 net/ceph/osdmap.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/ceph/osdmap.c b/net/ceph/osdmap.c
index 2823bb3cff55..6ec5007f96dc 100644
--- a/net/ceph/osdmap.c
+++ b/net/ceph/osdmap.c
@@ -571,9 +571,9 @@ static struct crush_map *crush_decode(void *pbyval, void *end)
 			goto bad;
 #endif
 		r = kmalloc(struct_size(r, steps, yes), GFP_NOFS);
-		c->rules[i] = r;
 		if (r == NULL)
 			goto badmem;
+		c->rules[i] = r;
 		dout(" rule %d is at %p\n", i, r);
 		r->len = yes;
 		ceph_decode_copy_safe(p, end, &r->mask, 4, bad); /* 4 u8's */
-- 
2.11.0