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| author | Jeff Layton <jlayton@redhat.com> | 2011-08-05 09:02:40 -0400 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2011-08-05 15:03:09 +0000 |
| commit | 80975d21aae2136ccae1ce914a1602dc1d8b0795 (patch) | |
| tree | e2c5d8b441d3ff206c9dc671ade8f3d7c453e2d2 /fs | |
| parent | f9e8c45002cacad536b338dfa9e910e341a49c31 (diff) | |
| download | linux-80975d21aae2136ccae1ce914a1602dc1d8b0795.tar.gz linux-80975d21aae2136ccae1ce914a1602dc1d8b0795.tar.bz2 linux-80975d21aae2136ccae1ce914a1602dc1d8b0795.zip | |
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.c | 4 |
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); |