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smb: client: fix potential UAF in cifs_signal_cifsd_for_reconnect()

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commit e0e50401cc3921c9eaf1b0e667db174519ea939f upstream.

Skip sessions that are being teared down (status == SES_EXITING) to
avoid UAF.

Cc: stable@vger.kernel.org
Signed-off-by: Paulo Alcantara (Red Hat) <pc@manguebit.com>
Signed-off-by: Steve French <stfrench@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Paulo Alcantara 2024-04-02 16:34:04 -03:00 committed by Greg Kroah-Hartman
parent aa582b33f9
commit 2cfff21732
1 changed files with 2 additions and 0 deletions
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2
fs/smb/client/connect.c
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@ -178,6 +178,8 @@ cifs_signal_cifsd_for_reconnect(struct TCP_Server_Info *server,
spin_lock(&cifs_tcp_ses_lock);
list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
if (cifs_ses_exiting(ses))
continue;
spin_lock(&ses->chan_lock);
for (i = 0; i < ses->chan_count; i++) {
if (!ses->chans[i].server)