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authorRonnie Sahlberg <lsahlber@redhat.com>2022-04-13 03:02:17 +0300
committerSteve French <stfrench@microsoft.com>2022-04-14 08:07:36 +0300
commit8b6c58458ee3206dde345fce327a4cb83e69caf9 (patch)
tree7f5d022280835e26823cc8171c38685a7d5395fc /fs
parent64c4a37ac04eeb43c42d272f6e6c8c12bfcf4304 (diff)
downloadlinux-8b6c58458ee3206dde345fce327a4cb83e69caf9.tar.xz
cifs: verify that tcon is valid before dereference in cifs_kill_sb
On umount, cifs_sb->tlink_tree might contain entries that do not represent a valid tcon. Check the tcon for error before we dereference it. Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com> Cc: stable@vger.kernel.org Reviewed-by: Shyam Prasad N <sprasad@microsoft.com> Reported-by: Xiaoli Feng <xifeng@redhat.com> Signed-off-by: Steve French <stfrench@microsoft.com>
Diffstat (limited to 'fs')
-rw-r--r--fs/cifs/cifsfs.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/cifs/cifsfs.c b/fs/cifs/cifsfs.c
index aba0783a8f09..2b1a1c029c75 100644
--- a/fs/cifs/cifsfs.c
+++ b/fs/cifs/cifsfs.c
@@ -266,10 +266,11 @@ static void cifs_kill_sb(struct super_block *sb)
* before we kill the sb.
*/
if (cifs_sb->root) {
- node = rb_first(root);
- while (node != NULL) {
+ for (node = rb_first(root); node; node = rb_next(node)) {
tlink = rb_entry(node, struct tcon_link, tl_rbnode);
tcon = tlink_tcon(tlink);
+ if (IS_ERR(tcon))
+ continue;
cfid = &tcon->crfid;
mutex_lock(&cfid->fid_mutex);
if (cfid->dentry) {
@@ -277,7 +278,6 @@ static void cifs_kill_sb(struct super_block *sb)
cfid->dentry = NULL;
}
mutex_unlock(&cfid->fid_mutex);
- node = rb_next(node);
}
/* finally release root dentry */