diff options
| author | Nigel Cunningham <nigel@nigel.suspend2.net> | 2008-01-17 15:21:21 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@woody.linux-foundation.org> | 2008-01-17 15:38:59 -0800 |
| commit | 784680336b616dcc4c17cbd25add3b49c555cdeb (patch) | |
| tree | e607ed69188a99590a7708c922500882702b8578 | |
| parent | 34aebfd3bdc93c0c5614f1f61e43b6ddc4be52ae (diff) | |
| download | lwn-784680336b616dcc4c17cbd25add3b49c555cdeb.tar.gz lwn-784680336b616dcc4c17cbd25add3b49c555cdeb.zip | |
Fix unbalanced helper_lock in kernel/kmod.c
call_usermodehelper_exec() has an exit path that can leave the
helper_lock() call at the top of the routine unbalanced. The attached
patch fixes this issue.
Signed-off-by: Nigel Cunningham <nigel@tuxonice.net>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | kernel/kmod.c | 13 |
1 files changed, 6 insertions, 7 deletions
diff --git a/kernel/kmod.c b/kernel/kmod.c index c6a4f8aebeba..bb7df2a28bd7 100644 --- a/kernel/kmod.c +++ b/kernel/kmod.c @@ -451,13 +451,11 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, enum umh_wait wait) { DECLARE_COMPLETION_ONSTACK(done); - int retval; + int retval = 0; helper_lock(); - if (sub_info->path[0] == '\0') { - retval = 0; + if (sub_info->path[0] == '\0') goto out; - } if (!khelper_wq || usermodehelper_disabled) { retval = -EBUSY; @@ -468,13 +466,14 @@ int call_usermodehelper_exec(struct subprocess_info *sub_info, sub_info->wait = wait; queue_work(khelper_wq, &sub_info->work); - if (wait == UMH_NO_WAIT) /* task has freed sub_info */ - return 0; + if (wait == UMH_NO_WAIT) /* task has freed sub_info */ + goto unlock; wait_for_completion(&done); retval = sub_info->retval; - out: +out: call_usermodehelper_freeinfo(sub_info); +unlock: helper_unlock(); return retval; } |