From: Paulo Alcantara <pc@manguebit.com>
[ Upstream commit 22863485a4626ec6ecf297f4cc0aef709bc862e4 ]
Skip sessions that are being teared down (status == SES_EXITING) to
avoid UAF.
Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
[ Appropriate path used. ]
Signed-off-by: Robert Garcia <rob_garcia@163.com>
---
fs/cifs/smb2misc.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/cifs/smb2misc.c b/fs/cifs/smb2misc.c
index b84e682b4cae..da32b3f6686b 100644
--- a/fs/cifs/smb2misc.c
+++ b/fs/cifs/smb2misc.c
@@ -679,6 +679,8 @@ smb2_is_valid_oplock_break(char *buffer, struct TCP_Server_Info *server)
/* look up tcon based on tid & uid */
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &server->smb_ses_list, smb_ses_list) {
+ if (cifs_ses_exiting(ses))
+ continue;
list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
spin_lock(&tcon->open_file_lock);
--
2.34.1