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@xxxxxxxxxxxxxxx>. 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 29954d5b1e0d67a4cd61c30c2201030c97e94b1e # <resolve conflicts, build, test, etc.> git commit -s git send-email --to '<stable@xxxxxxxxxxxxxxx>' --in-reply-to '2023112438-prankster-similarly-0617@gregkh' --subject-prefix 'PATCH 4.19.y' HEAD^.. Possible dependencies: 29954d5b1e0d ("cifs: fix leak of iface for primary channel") 38c8a9a52082 ("smb: move client and server files to common directory fs/smb") abdb1742a312 ("cifs: get rid of mount options string parsing") 9fd29a5bae6e ("cifs: use fs_context for automounts") 5dd8ce24667a ("cifs: missing directory in MAINTAINERS file") 332019e23a51 ("Merge tag '5.20-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6") thanks, greg k-h ------------------ original commit in Linus's tree ------------------ >From 29954d5b1e0d67a4cd61c30c2201030c97e94b1e Mon Sep 17 00:00:00 2001 From: Shyam Prasad N <sprasad@xxxxxxxxxxxxx> Date: Tue, 14 Nov 2023 04:54:12 +0000 Subject: [PATCH] cifs: fix leak of iface for primary channel My last change in this area introduced a change which accounted for primary channel in the interface ref count. However, it did not reduce this ref count on deallocation of the primary channel. i.e. during umount. Fixing this leak here, by dropping this ref count for primary channel while freeing up the session. Fixes: fa1d0508bdd4 ("cifs: account for primary channel in the interface list") Cc: stable@xxxxxxxxxxxxxxx Reported-by: Paulo Alcantara <pc@xxxxxxxxxxxxx> Signed-off-by: Shyam Prasad N <sprasad@xxxxxxxxxxxxx> Signed-off-by: Steve French <stfrench@xxxxxxxxxxxxx> diff --git a/fs/smb/client/connect.c b/fs/smb/client/connect.c index 57c2a7df3457..f896f60c924b 100644 --- a/fs/smb/client/connect.c +++ b/fs/smb/client/connect.c @@ -2065,6 +2065,12 @@ void __cifs_put_smb_ses(struct cifs_ses *ses) ses->chans[i].server = NULL; } + /* we now account for primary channel in iface->refcount */ + if (ses->chans[0].iface) { + kref_put(&ses->chans[0].iface->refcount, release_iface); + ses->chans[0].server = NULL; + } + sesInfoFree(ses); cifs_put_tcp_session(server, 0); }
