commit: 80975d21aae2136ccae1ce914a1602dc1d8b0795
From: Jeff Layton <[email protected]>
Date: Fri, 5 Aug 2011 09:02:40 -0400
Subject: [PATCH] cifs: cope with negative dentries in cifs_get_root
The loop around lookup_one_len doesn't handle the case where it might
return a negative dentry, which can cause an oops on the next pass
through the loop. Check for that and break out of the loop with an
error of -ENOENT if there is one.
Fixes the panic reported here:
https://bugzilla.redhat.com/show_bug.cgi?id=727927
Reported-by: TR Bentley <[email protected]>
Reported-by: Iain Arnell <[email protected]>
Cc: Al Viro <[email protected]>
Cc: [email protected]
Signed-off-by: Jeff Layton <[email protected]>
Signed-off-by: Steve French <[email protected]>
---
fs/cifs/cifsfs.c | 4 ++++
1 files changed, 4 insertions(+), 0 deletions(-)
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 212e562..f93eb94 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -563,6 +563,10 @@ cifs_get_root(struct smb_vol *vol, struct super_block *sb)
mutex_unlock(&dir->i_mutex);
dput(dentry);
dentry = child;
+ if (!dentry->d_inode) {
+ dput(dentry);
+ dentry = ERR_PTR(-ENOENT);
+ }
} while (!IS_ERR(dentry));
_FreeXid(xid);
kfree(full_path);
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