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| author | Oleg Nesterov <oleg@redhat.com> | 2009-01-18 18:17:20 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@kvm.kroah.org> | 2009-01-28 15:49:05 -0800 |
| commit | 1176e83aff6f15b6ae4d1b53c16124884ad29363 (patch) | |
| tree | cc808cf2a4f9b6306277bab178f3f055d54765a6 /drivers | |
| parent | 191805ac41a63929003faa33365027d3fb924d71 (diff) | |
| download | linux-1176e83aff6f15b6ae4d1b53c16124884ad29363.tar.gz linux-1176e83aff6f15b6ae4d1b53c16124884ad29363.tar.bz2 linux-1176e83aff6f15b6ae4d1b53c16124884ad29363.zip | |
Staging: android: task_get_unused_fd_flags: fix the wrong usage of tsk->signal
Compile tested.
task_struct->signal is not protected by RCU, the code is bogus.
Change the code to take ->siglock to pin ->signal.
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Cc: Arve Hjønnevåg <arve@android.com>
Cc: Brian Swetland <swetland@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/android/binder.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/staging/android/binder.c b/drivers/staging/android/binder.c index ab014bc96831..758131cad08a 100644 --- a/drivers/staging/android/binder.c +++ b/drivers/staging/android/binder.c @@ -319,6 +319,7 @@ int task_get_unused_fd_flags(struct task_struct *tsk, int flags) int fd, error; struct fdtable *fdt; unsigned long rlim_cur; + unsigned long irqs; if (files == NULL) return -ESRCH; @@ -335,12 +336,11 @@ repeat: * N.B. For clone tasks sharing a files structure, this test * will limit the total number of files that can be opened. */ - rcu_read_lock(); - if (tsk->signal) + rlim_cur = 0; + if (lock_task_sighand(tsk, &irqs)) { rlim_cur = tsk->signal->rlim[RLIMIT_NOFILE].rlim_cur; - else - rlim_cur = 0; - rcu_read_unlock(); + unlock_task_sighand(tsk, &irqs); + } if (fd >= rlim_cur) goto out; |