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| author | Oleg Nesterov <oleg@redhat.com> | 2014-10-10 00:25:32 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-10-10 04:25:49 +0200 |
| commit | 0d5f5f45f9a4f1f6b694c37f5142ebea893f0a15 (patch) | |
| tree | 6b9a19ef25763611d857d19f129ca74c186b46c5 /fs/proc | |
| parent | fs/proc/task_mmu.c: cleanup the "tail_vma" horror in m_next() (diff) | |
| download | linux-0d5f5f45f9a4f1f6b694c37f5142ebea893f0a15.tar.xz linux-0d5f5f45f9a4f1f6b694c37f5142ebea893f0a15.zip | |
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>
Diffstat (limited to 'fs/proc')
| -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 b7e31836a005..30aa2dd3e6f5 100644 --- a/fs/proc/task_mmu.c +++ b/fs/proc/task_mmu.c @@ -146,17 +146,12 @@ 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 * vmacache 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; @@ -228,8 +223,10 @@ 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, |