The patch below does not apply to the 5.4-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-5.4.y git checkout FETCH_HEAD git cherry-pick -x 8094a600245e9b28eb36a13036f202ad67c1f887 # <resolve conflicts, build, test, etc.> git commit -s git send-email --to 'stable@vger.kernel.org' --in-reply-to '2024042916-rebate-duct-2b7b@gregkh' --subject-prefix 'PATCH 5.4.y' HEAD^..
Possible dependencies:
8094a600245e ("smb3: missing lock when picking channel") 38c8a9a52082 ("smb: move client and server files to common directory fs/smb") ea90708d3cf3 ("cifs: use the least loaded channel for sending requests") 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 8094a600245e9b28eb36a13036f202ad67c1f887 Mon Sep 17 00:00:00 2001 From: Steve French stfrench@microsoft.com Date: Thu, 25 Apr 2024 11:30:16 -0500 Subject: [PATCH] smb3: missing lock when picking channel
Coverity spotted a place where we should have been holding the channel lock when accessing the ses channel index.
Addresses-Coverity: 1582039 ("Data race condition (MISSING_LOCK)") Cc: stable@vger.kernel.org Reviewed-by: Shyam Prasad N sprasad@microsoft.com Signed-off-by: Steve French stfrench@microsoft.com
diff --git a/fs/smb/client/transport.c b/fs/smb/client/transport.c index 994d70193432..e1a79e031b28 100644 --- a/fs/smb/client/transport.c +++ b/fs/smb/client/transport.c @@ -1057,9 +1057,11 @@ struct TCP_Server_Info *cifs_pick_channel(struct cifs_ses *ses) index = (uint)atomic_inc_return(&ses->chan_seq); index %= ses->chan_count; } + + server = ses->chans[index].server; spin_unlock(&ses->chan_lock);
- return ses->chans[index].server; + return server; }
int