| [PATCH] proc: check vma->vm_file before dereferencing [message #48349] |
Mon, 15 October 2012 15:30  |
Stanislav Kinsbursky
Messages: 683
Registered: October 2011
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Senior Member |
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It can be equal to NULL.
Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com>
---
fs/proc/base.c | 5 +++--
1 files changed, 3 insertions(+), 2 deletions(-)
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 144a967..74fc562 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -1770,8 +1770,9 @@ static struct dentry *proc_map_files_lookup(struct inode *dir,
if (!vma)
goto out_no_vma;
- result = proc_map_files_instantiate(dir, dentry, task,
- (void *)(unsigned long)vma->vm_file->f_mode);
+ if (vma->vm_file)
+ result = proc_map_files_instantiate(dir, dentry, task,
+ (void *)(unsigned long)vma->vm_file->f_mode);
out_no_vma:
up_read(&mm->mmap_sem);
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