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authorJeff Layton <jlayton@redhat.com>2011-08-05 17:02:40 +0400
committerSteve French <sfrench@us.ibm.com>2011-08-05 19:03:09 +0400
commit80975d21aae2136ccae1ce914a1602dc1d8b0795 (patch)
treee2c5d8b441d3ff206c9dc671ade8f3d7c453e2d2 /fs
parentf9e8c45002cacad536b338dfa9e910e341a49c31 (diff)
downloadlinux-80975d21aae2136ccae1ce914a1602dc1d8b0795.tar.xz
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 <home@trarbentley.net> Reported-by: Iain Arnell <iarnell@gmail.com> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: stable@kernel.org Signed-off-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsfs.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 212e5629cc1d..f93eb948d071 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);