qla2xxx: Terminate exchange if corrupted

Corrupted ATIO is defined as length of fcp_header & fcp_cmd
payload is less than 0x38. It's the minimum size for a frame to
carry 8..16 bytes SCSI CDB. The exchange will be dropped or
terminated if corrupted.

Signed-off-by: Quinn Tran <quinn.tran@cavium.com>
Signed-off-by: Himanshu Madhani <himanshu.madhani@cavium.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
[ bvanassche: Fixed spelling in patch title ]
Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>

diff --git a/drivers/scsi/qla2xxx/qla_def.h b/drivers/scsi/qla2xxx/qla_def.h
index f7df01b..1f7c6d2 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_def.h
+++ b/drivers/scsi/qla2xxx/qla_def.h
@@ -1556,7 +1556,8 @@ typedef struct {
 struct atio {
        uint8_t         entry_type;             /* Entry type. */
        uint8_t         entry_count;            /* Entry count. */
-       uint8_t         data[58];
+       __le16          attr_n_length;
+       uint8_t         data[56];
        uint32_t        signature;
 #define ATIO_PROCESSED 0xDEADDEAD              /* Signature */
 };

diff --git a/drivers/scsi/qla2xxx/qla_target.c b/drivers/scsi/qla2xxx/qla_target.c
index 6eb0517..85dcd7c 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.c
+++ b/drivers/scsi/qla2xxx/qla_target.c
@@ -6454,12 +6454,29 @@ qlt_24xx_process_atio_queue(struct scsi_qla_host *vha, uint8_t ha_locked)
        if (!vha->flags.online)
                return;
 
-       while (ha->tgt.atio_ring_ptr->signature != ATIO_PROCESSED) {
+       while ((ha->tgt.atio_ring_ptr->signature != ATIO_PROCESSED) ||
+           fcpcmd_is_corrupted(ha->tgt.atio_ring_ptr)) {
                pkt = (struct atio_from_isp *)ha->tgt.atio_ring_ptr;
                cnt = pkt->u.raw.entry_count;
 
-               qlt_24xx_atio_pkt_all_vps(vha, (struct atio_from_isp *)pkt,
-                   ha_locked);
+               if (unlikely(fcpcmd_is_corrupted(ha->tgt.atio_ring_ptr))) {
+                       /*
+                        * This packet is corrupted. The header + payload
+                        * can not be trusted. There is no point in passing
+                        * it further up.
+                        */
+                       ql_log(ql_log_warn, vha, 0xffff,
+                           "corrupted fcp frame SID[%3phN] OXID[%04x] EXCG[%x] %64phN\n",
+                           pkt->u.isp24.fcp_hdr.s_id,
+                           be16_to_cpu(pkt->u.isp24.fcp_hdr.ox_id),
+                           le32_to_cpu(pkt->u.isp24.exchange_addr), pkt);
+
+                       adjust_corrupted_atio(pkt);
+                       qlt_send_term_exchange(vha, NULL, pkt, ha_locked, 0);
+               } else {
+                       qlt_24xx_atio_pkt_all_vps(vha,
+                           (struct atio_from_isp *)pkt, ha_locked);
+               }
 
                for (i = 0; i < cnt; i++) {
                        ha->tgt.atio_ring_index++;

diff --git a/drivers/scsi/qla2xxx/qla_target.h b/drivers/scsi/qla2xxx/qla_target.h
index f26c5f6..0824a81 100644 (file)
--- a/drivers/scsi/qla2xxx/qla_target.h
+++ b/drivers/scsi/qla2xxx/qla_target.h
@@ -427,13 +427,33 @@ struct atio_from_isp {
                struct {
                        uint8_t  entry_type;    /* Entry type. */
                        uint8_t  entry_count;   /* Entry count. */
-                       uint8_t  data[58];
+                       __le16   attr_n_length;
+#define FCP_CMD_LENGTH_MASK 0x0fff
+#define FCP_CMD_LENGTH_MIN  0x38
+                       uint8_t  data[56];
                        uint32_t signature;
 #define ATIO_PROCESSED 0xDEADDEAD              /* Signature */
                } raw;
        } u;
 } __packed;
 
+static inline int fcpcmd_is_corrupted(struct atio *atio)
+{
+       if (atio->entry_type == ATIO_TYPE7 &&
+           (le16_to_cpu(atio->attr_n_length & FCP_CMD_LENGTH_MASK) <
+           FCP_CMD_LENGTH_MIN))
+               return 1;
+       else
+               return 0;
+}
+
+/* adjust corrupted atio so we won't trip over the same entry again. */
+static inline void adjust_corrupted_atio(struct atio_from_isp *atio)
+{
+       atio->u.raw.attr_n_length = cpu_to_le16(FCP_CMD_LENGTH_MIN);
+       atio->u.isp24.fcp_cmnd.add_cdb_len = 0;
+}
+
 #define CTIO_TYPE7 0x12 /* Continue target I/O entry (for 24xx) */
 
 /*