cifs: Fix use-after-free on mid_q_entry
With CIFS_DEBUG_2 enabled, additional debug information is tracked inside each mid_q_entry struct, however cifs_save_when_sent may use the mid_q_entry after it has been freed from the appropriate callback if the transport layer has very low latency. Holding the srv_mutex fixes this use-after-free, as cifs_save_when_sent is called while the srv_mutex is held while the request is sent. Signed-off-by: Christopher Oo <t-chriso@microsoft.com>
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@ -696,7 +696,9 @@ cifs_echo_callback(struct mid_q_entry *mid)
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{
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{
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struct TCP_Server_Info *server = mid->callback_data;
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struct TCP_Server_Info *server = mid->callback_data;
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mutex_lock(&server->srv_mutex);
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DeleteMidQEntry(mid);
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DeleteMidQEntry(mid);
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mutex_unlock(&server->srv_mutex);
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add_credits(server, 1, CIFS_ECHO_OP);
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add_credits(server, 1, CIFS_ECHO_OP);
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}
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}
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@ -1572,7 +1574,9 @@ cifs_readv_callback(struct mid_q_entry *mid)
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}
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}
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queue_work(cifsiod_wq, &rdata->work);
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queue_work(cifsiod_wq, &rdata->work);
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mutex_lock(&server->srv_mutex);
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DeleteMidQEntry(mid);
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DeleteMidQEntry(mid);
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mutex_unlock(&server->srv_mutex);
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add_credits(server, 1, 0);
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add_credits(server, 1, 0);
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}
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}
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@ -2032,6 +2036,7 @@ cifs_writev_callback(struct mid_q_entry *mid)
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{
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{
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struct cifs_writedata *wdata = mid->callback_data;
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struct cifs_writedata *wdata = mid->callback_data;
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struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
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struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
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struct TCP_Server_Info *server = tcon->ses->server;
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unsigned int written;
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unsigned int written;
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WRITE_RSP *smb = (WRITE_RSP *)mid->resp_buf;
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WRITE_RSP *smb = (WRITE_RSP *)mid->resp_buf;
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@ -2068,7 +2073,9 @@ cifs_writev_callback(struct mid_q_entry *mid)
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}
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}
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queue_work(cifsiod_wq, &wdata->work);
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queue_work(cifsiod_wq, &wdata->work);
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mutex_lock(&server->srv_mutex);
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DeleteMidQEntry(mid);
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DeleteMidQEntry(mid);
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mutex_unlock(&server->srv_mutex);
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add_credits(tcon->ses->server, 1, 0);
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add_credits(tcon->ses->server, 1, 0);
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}
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}
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@ -1626,7 +1626,9 @@ smb2_echo_callback(struct mid_q_entry *mid)
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if (mid->mid_state == MID_RESPONSE_RECEIVED)
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if (mid->mid_state == MID_RESPONSE_RECEIVED)
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credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
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credits_received = le16_to_cpu(smb2->hdr.CreditRequest);
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mutex_lock(&server->srv_mutex);
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DeleteMidQEntry(mid);
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DeleteMidQEntry(mid);
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mutex_unlock(&server->srv_mutex);
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add_credits(server, credits_received, CIFS_ECHO_OP);
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add_credits(server, credits_received, CIFS_ECHO_OP);
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}
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}
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@ -1810,7 +1812,9 @@ smb2_readv_callback(struct mid_q_entry *mid)
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cifs_stats_fail_inc(tcon, SMB2_READ_HE);
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cifs_stats_fail_inc(tcon, SMB2_READ_HE);
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queue_work(cifsiod_wq, &rdata->work);
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queue_work(cifsiod_wq, &rdata->work);
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mutex_lock(&server->srv_mutex);
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DeleteMidQEntry(mid);
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DeleteMidQEntry(mid);
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mutex_unlock(&server->srv_mutex);
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add_credits(server, credits_received, 0);
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add_credits(server, credits_received, 0);
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}
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}
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@ -1938,6 +1942,7 @@ smb2_writev_callback(struct mid_q_entry *mid)
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{
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{
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struct cifs_writedata *wdata = mid->callback_data;
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struct cifs_writedata *wdata = mid->callback_data;
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struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
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struct cifs_tcon *tcon = tlink_tcon(wdata->cfile->tlink);
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struct TCP_Server_Info *server = tcon->ses->server;
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unsigned int written;
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unsigned int written;
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struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
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struct smb2_write_rsp *rsp = (struct smb2_write_rsp *)mid->resp_buf;
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unsigned int credits_received = 1;
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unsigned int credits_received = 1;
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@ -1977,7 +1982,9 @@ smb2_writev_callback(struct mid_q_entry *mid)
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cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
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cifs_stats_fail_inc(tcon, SMB2_WRITE_HE);
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queue_work(cifsiod_wq, &wdata->work);
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queue_work(cifsiod_wq, &wdata->work);
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mutex_lock(&server->srv_mutex);
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DeleteMidQEntry(mid);
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DeleteMidQEntry(mid);
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mutex_unlock(&server->srv_mutex);
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add_credits(tcon->ses->server, credits_received, 0);
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add_credits(tcon->ses->server, credits_received, 0);
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}
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}
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@ -644,7 +644,9 @@ cifs_sync_mid_result(struct mid_q_entry *mid, struct TCP_Server_Info *server)
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}
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}
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spin_unlock(&GlobalMid_Lock);
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spin_unlock(&GlobalMid_Lock);
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mutex_lock(&server->srv_mutex);
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DeleteMidQEntry(mid);
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DeleteMidQEntry(mid);
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mutex_unlock(&server->srv_mutex);
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return rc;
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return rc;
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}
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}
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