smb: client: fix potential UAF in smb2_is_valid_lease_break()
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>
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@ -622,6 +622,8 @@ smb2_is_valid_lease_break(char *buffer, struct TCP_Server_Info *server)
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/* look up tcon based on tid & uid */
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spin_lock(&cifs_tcp_ses_lock);
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list_for_each_entry(ses, &pserver->smb_ses_list, smb_ses_list) {
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if (cifs_ses_exiting(ses))
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continue;
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list_for_each_entry(tcon, &ses->tcon_list, tcon_list) {
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spin_lock(&tcon->open_file_lock);
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cifs_stats_inc(
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