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proc: mem_release() should check mm != NULL

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commit 71879d3cb3 upstream.

mem_release() can hit mm == NULL, add the necessary check.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Oleg Nesterov
2012-01-31 17:14:38 +01:00
committed by Greg Kroah-Hartman
parent 344d390bcb
commit 401f63716c
1 changed files with 2 additions and 2 deletions
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4
fs/proc/base.c
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@@ -886,8 +886,8 @@ loff_t mem_lseek(struct file *file, loff_t offset, int orig)
static int mem_release(struct inode *inode, struct file *file)
{
struct mm_struct *mm = file->private_data;
mmput(mm);
if (mm)
mmput(mm);
return 0;
}