diff options
| author | Oleg Nesterov <oleg@redhat.com> | 2014-10-09 15:25:32 -0700 |
|---|---|---|
| committer | Moyster <oysterized@gmail.com> | 2016-09-28 15:15:09 +0200 |
| commit | b1ab995bf91d5ded49152536220b558b26a31126 (patch) | |
| tree | 037497604a31310b9f2d4a81db10b0b25d399dde | |
| parent | d814a0896cd70721ccb2c372f831c2eaf4847f51 (diff) | |
fs/proc/task_mmu.c: shift "priv->task = NULL" from m_start() to m_stop()
1. There is no reason to reset ->tail_vma in m_start(), if we return
IS_ERR_OR_NULL() it won't be used.
2. m_start() also clears priv->task to ensure that m_stop() won't use
the stale pointer if we fail before get_task_struct(). But this is
ugly and confusing, move this initialization in m_stop().
Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Acked-by: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: "Eric W. Biederman" <ebiederm@xmission.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: W4TCH0UT <ateekujjawal@gmail.com>
| -rw-r--r-- | fs/proc/task_mmu.c | 9 |
1 files changed, 3 insertions, 6 deletions
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c index 2254f1d3a..45ae8ce0f 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -201,17 +201,12 @@ static void *m_start(struct seq_file *m, loff_t *pos) struct vm_area_struct *vma, *tail_vma = NULL; loff_t l = *pos; - /* Clear the per syscall fields in priv */ - priv->task = NULL; - priv->tail_vma = NULL; - /* * We remember last_addr rather than next_addr to hit with * mmap_cache most of the time. We have zero last_addr at * the beginning and also after lseek. We will have -1 last_addr * after the end of the vmas. */ - if (last_addr == -1UL) return NULL; @@ -283,8 +278,10 @@ static void m_stop(struct seq_file *m, void *v) if (!IS_ERR_OR_NULL(v)) vma_stop(priv); - if (priv->task) + if (priv->task) { put_task_struct(priv->task); + priv->task = NULL; + } } static int proc_maps_open(struct inode *inode, struct file *file, |