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authorAl Viro <viro@zeniv.linux.org.uk>2011-06-17 08:34:57 -0400
committerAl Viro <viro@zeniv.linux.org.uk>2011-06-24 18:39:41 -0400
commit6d6861757dfadb7d6aec6bb34acd471210a755f9 (patch)
tree6de2a3443afacc51cb307619e0a5d90ec22c0786 /fs
parentdd8544661947ad6d8d87b3c9d4333bfa1583d1bc (diff)
cifs: double free on mount failure
if we get to out_super with ->s_root already set (e.g. with cifs_get_root() failure), we'll end up with cifs_put_super() called and ->mountdata freed twice. We'll also get cifs_sb freed twice and cifs_sb->local_nls dropped twice. The problem is, we can get to out_super both with and without ->s_root, which makes ->put_super() a bad place for such work. Switch to ->kill_sb(), have all that work done there after kill_anon_super(). Unlike ->put_super(), ->kill_sb() is called by deactivate_locked_super() whether we have ->s_root or not. Acked-by: Pavel Shilovsky <piastryyy@gmail.com> Reviewed-by: Jeff Layton <jlayton@redhat.com> Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsfs.c14
1 files changed, 8 insertions, 6 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index 5d3c4fa4b54..dc76c7bccb1 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -184,11 +184,13 @@ cifs_put_super(struct super_block *sb)
rc = cifs_umount(sb, cifs_sb);
if (rc)
cERROR(1, "cifs_umount failed with return code %d", rc);
- if (cifs_sb->mountdata) {
- kfree(cifs_sb->mountdata);
- cifs_sb->mountdata = NULL;
- }
+}
+static void cifs_kill_sb(struct super_block *sb)
+{
+ struct cifs_sb_info *cifs_sb = CIFS_SB(sb);
+ kill_anon_super(sb);
+ kfree(cifs_sb->mountdata);
unload_nls(cifs_sb->local_nls);
kfree(cifs_sb);
}
@@ -729,8 +731,8 @@ out_shared:
goto out;
out_super:
- kfree(cifs_sb->mountdata);
deactivate_locked_super(sb);
+ goto out;
out_cifs_sb:
unload_nls(cifs_sb->local_nls);
@@ -827,7 +829,7 @@ struct file_system_type cifs_fs_type = {
.owner = THIS_MODULE,
.name = "cifs",
.mount = cifs_do_mount,
- .kill_sb = kill_anon_super,
+ .kill_sb = cifs_kill_sb,
/* .fs_flags */
};
const struct inode_operations cifs_dir_inode_ops = {