Patch "cifs: Fix connections leak when tlink setup failed" has been added to the 5.15-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    cifs: Fix connections leak when tlink setup failed

to the 5.15-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     cifs-fix-connections-leak-when-tlink-setup-failed.patch
and it can be found in the queue-5.15 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 0c3d07dc46d1809c84602e13e534b3781e2b0d81
Author: Zhang Xiaoxu <zhangxiaoxu5@xxxxxxxxxx>
Date:   Fri Nov 11 15:12:12 2022 +0800

    cifs: Fix connections leak when tlink setup failed
    
    [ Upstream commit 1dcdf5f5b2137185cbdd5385f29949ab3da4f00c ]
    
    If the tlink setup failed, lost to put the connections, then
    the module refcnt leak since the cifsd kthread not exit.
    
    Also leak the fscache info, and for next mount with fsc, it will
    print the follow errors:
      CIFS: Cache volume key already in use (cifs,127.0.0.1:445,TEST)
    
    Let's check the result of tlink setup, and do some cleanup.
    
    Fixes: 56c762eb9bee ("cifs: Refactor out cifs_mount()")
    Reviewed-by: Paulo Alcantara (SUSE) <pc@xxxxxx>
    Signed-off-by: Zhang Xiaoxu <zhangxiaoxu5@xxxxxxxxxx>
    Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 902eb8a5afd2..839059b8a9c9 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -3550,9 +3550,13 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
 	uuid_copy(&cifs_sb->dfs_mount_id, &mnt_ctx.mount_id);
 
 out:
-	free_xid(mnt_ctx.xid);
 	cifs_try_adding_channels(cifs_sb, mnt_ctx.ses);
-	return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
+	rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
+	if (rc)
+		goto error;
+
+	free_xid(mnt_ctx.xid);
+	return rc;
 
 error:
 	dfs_cache_put_refsrv_sessions(&mnt_ctx.mount_id);
@@ -3579,8 +3583,12 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
 			goto error;
 	}
 
+	rc = mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
+	if (rc)
+		goto error;
+
 	free_xid(mnt_ctx.xid);
-	return mount_setup_tlink(cifs_sb, mnt_ctx.ses, mnt_ctx.tcon);
+	return rc;
 
 error:
 	mount_put_conns(&mnt_ctx);