taskstats: check nla_reserve() return

Addresses https://bugzilla.kernel.org/show_bug.cgi?id=44621

Reported-by: <rucsoftsec@gmail.com>
Signed-off-by: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/kernel/taskstats.c b/kernel/taskstats.c
index e66046456f4f..d0a32796550f 100644
--- a/kernel/taskstats.c
+++ b/kernel/taskstats.c
@@ -436,6 +436,11 @@ 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) {
+                rc = -EMSGSIZE;
+                goto err;
+        }
+
         stats = nla_data(na);
         memset(stats, 0, sizeof(*stats));