cifs: serialize other channels when query server interfaces is pending

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commit b5e3e6e28c upstream.

Today, during smb2_reconnect, session_mutex is released as soon as
the tcon is reconnected and is in a good state. However, in case
multichannel is enabled, there is also a query of server interfaces that
follows. We've seen that this query can race with reconnects of other
channels, causing them to step on each other with reconnects.

This change extends the hold of session_mutex till after the query of
server interfaces is complete. In order to avoid recursive smb2_reconnect
checks during query ioctl, this change also introduces a session flag
for sessions where such a query is in progress.

Signed-off-by: Shyam Prasad N <sprasad@microsoft.com>
Cc: stable@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

...

This commit is contained in:

Shyam Prasad N 2025-06-02 22:37:15 +05:30 • committed by Greg Kroah-Hartman

parent b735c8dfbf

commit 3b2bec886f

2 changed files with 19 additions and 6 deletions

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1

fs/smb/client/cifsglob.h

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24

fs/smb/client/smb2pdu.c

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