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proc: fix oops on invalid /proc/<pid>/maps access

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When m_start returns an error, the seq_file logic will still call m_stop
with that error entry, so we'd better make sure that we check it before
using it as a vma.

Introduced by commit ec6fd8a4355c ("report errors in /proc/*/*map*
sanely"), which replaced NULL with various ERR_PTR() cases.

(On ia64, you happen to get a unaligned fault instead of a page fault,
since the address used is generally some random error code like -EPERM)

Reported-by: Anca Emanuel <anca.emanuel@gmail.com>
Reported-by: Tony Luck <tony.luck@intel.com>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Américo Wang <xiyou.wangcong@gmail.com>
Cc: Stephen Wilson <wilsons@start.ca>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2011-03-27 19:09:29 -07:00
parent 16c29dafcc
commit 76597cd314
1 changed files with 2 additions and 1 deletions
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3
fs/proc/task_mmu.c
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@ -182,7 +182,8 @@ static void m_stop(struct seq_file *m, void *v)
struct proc_maps_private *priv = m->private;
struct vm_area_struct *vma = v;
vma_stop(priv, vma);
if (!IS_ERR(vma))
vma_stop(priv, vma);
if (priv->task)
put_task_struct(priv->task);
}