kernel/taskstats.c: fix bogus nlmsg_free()

We'd better not nlmsg_free on a pointer containing an undefined value
(and without having anything allocated).

Spotted by the Coverity checker.

Signed-off-by: Adrian Bunk <bunk@kernel.org>
Acked-by: Balbir Singh <balbir@linux.vnet.ibm>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 354e74b..07e86a8 100644 (file)
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -398,31 +398,31 @@ static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
 
        fd = nla_get_u32(info->attrs[CGROUPSTATS_CMD_ATTR_FD]);
        file = fget_light(fd, &fput_needed);
-       if (file) {
-               size = nla_total_size(sizeof(struct cgroupstats));
+       if (!file)
+               return 0;
 
-               rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb,
-                                       size);
-               if (rc < 0)
-                       goto err;
+       size = nla_total_size(sizeof(struct cgroupstats));
 
-               na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS,
-                                       sizeof(struct cgroupstats));
-               stats = nla_data(na);
-               memset(stats, 0, sizeof(*stats));
+       rc = prepare_reply(info, CGROUPSTATS_CMD_NEW, &rep_skb,
+                               size);
+       if (rc < 0)
+               goto err;
 
-               rc = cgroupstats_build(stats, file->f_dentry);
-               if (rc < 0)
-                       goto err;
+       na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS,
+                               sizeof(struct cgroupstats));
+       stats = nla_data(na);
+       memset(stats, 0, sizeof(*stats));
 
-               fput_light(file, fput_needed);
-               return send_reply(rep_skb, info->snd_pid);
+       rc = cgroupstats_build(stats, file->f_dentry);
+       if (rc < 0) {
+               nlmsg_free(rep_skb);
+               goto err;
        }
 
+       rc = send_reply(rep_skb, info->snd_pid);
+
 err:
-       if (file)
-               fput_light(file, fput_needed);
-       nlmsg_free(rep_skb);
+       fput_light(file, fput_needed);
        return rc;
 }