taskstats: cgroupstats_user_cmd() may leak on error

If prepare_reply() succeeds we have allocated memory for 'rep_skb'.  If
nla_reserve() then subsequently fails and returns NULL we fail to release
the memory we allocated, thus causing a leak.

Signed-off-by: Jesper Juhl <jj@chaosbits.net>
Cc: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 1 insertions, 0 deletions

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index 610f0838d555..145bb4d3bd4d 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -445,6 +445,7 @@ static int cgroupstats_user_cmd(struct sk_buff *skb, struct genl_info *info)
         na = nla_reserve(rep_skb, CGROUPSTATS_TYPE_CGROUP_STATS,
                                 sizeof(struct cgroupstats));
         if (na == NULL) {
+                nlmsg_free(rep_skb);
                 rc = -EMSGSIZE;
                 goto err;
         }