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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-04 19:25:11 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-05-05 02:19:59 +0200 |
| commit | fbfd1d2862a8316c7191bc551c6a842e6918abb0 (patch) | |
| tree | 06c5a391238bcf93bb3d7f2c587d069eeb6809e5 | |
| parent | ipc: move the rcu_read_lock() from sem_lock_and_putref() into callers (diff) | |
| download | linux-fbfd1d2862a8316c7191bc551c6a842e6918abb0.tar.xz linux-fbfd1d2862a8316c7191bc551c6a842e6918abb0.zip | |
ipc: fix double sem unlock in semctl error path
Fix another ipc locking buglet introduced by the scalability patches:
when semctl_down() was changed to delay the semaphore locking, one error
path for security_sem_semctl() went through the semaphore unlock logic
even though the semaphore had never been locked.
Introduced by commit 16df3674efe3 ("ipc,sem: do not hold ipc lock more
than necessary")
Acked-by: Davidlohr Bueso <davidlohr.bueso@hp.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | ipc/sem.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/ipc/sem.c b/ipc/sem.c index 8f5aa34f8d30..1f8f01a542de 100644 --- a/ipc/sem.c +++ b/ipc/sem.c @@ -1280,7 +1280,7 @@ static int semctl_down(struct ipc_namespace *ns, int semid, err = security_sem_semctl(sma, cmd); if (err) { rcu_read_unlock(); - goto out_unlock; + goto out_up; } switch(cmd){ |