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| author | Zhao Hongjiang <zhaohongjiang@huawei.com> | 2013-04-30 15:26:46 -0700 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-05-16 11:18:33 -0400 |
| commit | 8f9c6339ad5c1a5a9a07af9ffeba4269aef8d9fa (patch) | |
| tree | 3fef904864df99cfa637f0a41e08b495025cb7d6 /fs | |
| parent | 249b720420e28f13abf4a5ebbe0fea3b15494b89 (diff) | |
| download | linux-rt-8f9c6339ad5c1a5a9a07af9ffeba4269aef8d9fa.tar.gz | |
inotify: invalid mask should return a error number but not set it
[ Upstream commit 04df32fa10ab9a6f0643db2949d42efc966bc844 ]
When we run the crackerjack testsuite, the inotify_add_watch test is
stalled.
This is caused by the invalid mask 0 - the task is waiting for the event
but it never comes. inotify_add_watch() should return -EINVAL as it did
before commit 676a0675cf92 ("inotify: remove broken mask checks causing
unmount to be EINVAL"). That commit removes the invalid mask check, but
that check is needed.
Check the mask's ALL_INOTIFY_BITS before the inotify_arg_to_mask() call.
If none are set, just return -EINVAL.
Because IN_UNMOUNT is in ALL_INOTIFY_BITS, this change will not trigger
the problem that above commit fixed.
[akpm@linux-foundation.org: fix build]
Signed-off-by: Zhao Hongjiang <zhaohongjiang@huawei.com>
Acked-by: Jim Somerville <Jim.Somerville@windriver.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Jerome Marchand <jmarchan@redhat.com>
Cc: Eric Paris <eparis@parisplace.org>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/notify/inotify/inotify_user.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/fs/notify/inotify/inotify_user.c b/fs/notify/inotify/inotify_user.c index 8445fbc8985c..7e15ab00ebaf 100644 --- a/fs/notify/inotify/inotify_user.c +++ b/fs/notify/inotify/inotify_user.c @@ -577,7 +577,6 @@ static int inotify_update_existing_watch(struct fsnotify_group *group, int add = (arg & IN_MASK_ADD); int ret; - /* don't allow invalid bits: we don't want flags set */ mask = inotify_arg_to_mask(arg); if (unlikely(!(mask & IN_ALL_EVENTS))) return -EINVAL; @@ -630,7 +629,6 @@ static int inotify_new_watch(struct fsnotify_group *group, struct idr *idr = &group->inotify_data.idr; spinlock_t *idr_lock = &group->inotify_data.idr_lock; - /* don't allow invalid bits: we don't want flags set */ mask = inotify_arg_to_mask(arg); if (unlikely(!(mask & IN_ALL_EVENTS))) return -EINVAL; @@ -761,6 +759,10 @@ SYSCALL_DEFINE3(inotify_add_watch, int, fd, const char __user *, pathname, int ret, fput_needed; unsigned flags = 0; + /* don't allow invalid bits: we don't want flags set */ + if (unlikely(!(mask & ALL_INOTIFY_BITS))) + return -EINVAL; + filp = fget_light(fd, &fput_needed); if (unlikely(!filp)) return -EBADF; |