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authorMarkus Elfring <elfring@users.sourceforge.net>2019-09-25 16:48:17 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-09-25 17:51:41 -0700
commitc231740dd95e854de5034cff8f49737d942bc098 (patch)
treef7ba22624e5c50be90c98a4b59f48c51eab4f47b
parent97b0b1ad58fab9f71b1a6bc056a09af6065ec3bc (diff)
ipc/mqueue: improve exception handling in do_mq_notify()
Null pointers were assigned to local variables in a few cases as exception handling. The jump target “out” was used where no meaningful data processing actions should eventually be performed by branches of an if statement then. Use an additional jump target for calling dev_kfree_skb() directly. Return also directly after error conditions were detected when no extra clean-up is needed by this function implementation. Link: http://lkml.kernel.org/r/592ef10e-0b69-72d0-9789-fc48f638fdfd@web.de Signed-off-by: Markus Elfring <elfring@users.sourceforge.net> Cc: Davidlohr Bueso <dave@stgolabs.net> Cc: Manfred Spraul <manfred@colorfullife.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--ipc/mqueue.c20
1 files changed, 8 insertions, 12 deletions
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index b02eb842b42e..3d920ff15c80 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1240,15 +1240,14 @@ static int do_mq_notify(mqd_t mqdes, const struct sigevent *notification)
/* create the notify skb */
nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL);
- if (!nc) {
- ret = -ENOMEM;
- goto out;
- }
+ if (!nc)
+ return -ENOMEM;
+
if (copy_from_user(nc->data,
notification->sigev_value.sival_ptr,
NOTIFY_COOKIE_LEN)) {
ret = -EFAULT;
- goto out;
+ goto free_skb;
}
/* TODO: add a header? */
@@ -1264,8 +1263,7 @@ retry:
fdput(f);
if (IS_ERR(sock)) {
ret = PTR_ERR(sock);
- sock = NULL;
- goto out;
+ goto free_skb;
}
timeo = MAX_SCHEDULE_TIMEOUT;
@@ -1274,11 +1272,8 @@ retry:
sock = NULL;
goto retry;
}
- if (ret) {
- sock = NULL;
- nc = NULL;
- goto out;
- }
+ if (ret)
+ return ret;
}
}
@@ -1334,6 +1329,7 @@ out:
if (sock)
netlink_detachskb(sock, nc);
else
+free_skb:
dev_kfree_skb(nc);
return ret;