proc: mem_release() should check mm != NULL
mem_release() can hit mm == NULL, add the necessary check. Cc: stable@kernel.org Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -822,7 +822,7 @@ loff_t mem_lseek(struct file *file, loff_t offset, int orig)
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static int mem_release(struct inode *inode, struct file *file)
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{
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struct mm_struct *mm = file->private_data;
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if (mm)
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mmput(mm);
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return 0;
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}
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