The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
To reproduce the conflict and resubmit, you may use the following commands:
git fetch https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/ linux-4.19.y git checkout FETCH_HEAD git cherry-pick -x 5bff9f741af60b143a5ae73417a8ec47fd5ff2f4 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2023050756-majesty-santa-7227@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^..
Possible dependencies:
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From 5bff9f741af60b143a5ae73417a8ec47fd5ff2f4 Mon Sep 17 00:00:00 2001 From: Paulo Alcantara pc@manguebit.com Date: Thu, 27 Apr 2023 16:07:38 -0300 Subject: [PATCH] cifs: protect session status check in smb2_reconnect()
Use @ses->ses_lock to protect access of @ses->ses_status.
Cc: stable@vger.kernel.org Signed-off-by: Paulo Alcantara (SUSE) pc@manguebit.com Signed-off-by: Steve French stfrench@microsoft.com
diff --git a/fs/cifs/smb2pdu.c b/fs/cifs/smb2pdu.c index 0521aa1da644..3ce63f0cd9f5 100644 --- a/fs/cifs/smb2pdu.c +++ b/fs/cifs/smb2pdu.c @@ -175,8 +175,17 @@ smb2_reconnect(__le16 smb2_command, struct cifs_tcon *tcon, } } spin_unlock(&tcon->tc_lock); - if ((!tcon->ses) || (tcon->ses->ses_status == SES_EXITING) || - (!tcon->ses->server) || !server) + + ses = tcon->ses; + if (!ses) + return -EIO; + spin_lock(&ses->ses_lock); + if (ses->ses_status == SES_EXITING) { + spin_unlock(&ses->ses_lock); + return -EIO; + } + spin_unlock(&ses->ses_lock); + if (!ses->server || !server) return -EIO;
spin_lock(&server->srv_lock); @@ -204,8 +213,6 @@ again: if (rc) return rc;
- ses = tcon->ses; - spin_lock(&ses->chan_lock); if (!cifs_chan_needs_reconnect(ses, server) && !tcon->need_reconnect) { spin_unlock(&ses->chan_lock);