scsi: target: tcmu: avoid use-after-free after command timeout

In tcmu_handle_completion() function, the variable called read_len is
always initialized with a value taken from se_cmd structure. If this
function is called to complete an expired (timed out) out command, the
session command pointed by se_cmd is likely to be already deallocated by
the target core at that moment. As the result, this access triggers a
use-after-free warning from KASAN.

This patch fixes the code not to touch se_cmd when completing timed out
TCMU commands. It also resets the pointer to se_cmd at the time when the
TCMU_CMD_BIT_EXPIRED flag is set because it is going to become invalid
after calling target_complete_cmd() later in the same function,
tcmu_check_expired_cmd().
Signed-off-by: NDmitry Fomichev <dmitry.fomichev@wdc.com>
Acked-by: NMike Christie <mchristi@redhat.com>
Reviewed-by: NDamien Le Moal <damien.lemoal@wdc.com>
Signed-off-by: NMartin K. Petersen <martin.petersen@oracle.com>

drivers/target/target_core_user.c

@@ -1132,14 +1132,16 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
 	struct se_cmd *se_cmd = cmd->se_cmd;
 	struct tcmu_dev *udev = cmd->tcmu_dev;
 	bool read_len_valid = false;
-	uint32_t read_len = se_cmd->data_length;
+	uint32_t read_len;
 
 	/*
 	 * cmd has been completed already from timeout, just reclaim
 	 * data area space and free cmd
 	 */
-	if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags))
+	if (test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
+		WARN_ON_ONCE(se_cmd);
 		goto out;
+	}
 
 	list_del_init(&cmd->queue_entry);
 
@@ -1152,6 +1154,7 @@ static void tcmu_handle_completion(struct tcmu_cmd *cmd, struct tcmu_cmd_entry *
 		goto done;
 	}
 
+	read_len = se_cmd->data_length;
 	if (se_cmd->data_direction == DMA_FROM_DEVICE &&
 	    (entry->hdr.uflags & TCMU_UFLAG_READ_LEN) && entry->rsp.read_len) {
 		read_len_valid = true;
@@ -1307,6 +1310,7 @@ static int tcmu_check_expired_cmd(int id, void *p, void *data)
 		 */
 		scsi_status = SAM_STAT_CHECK_CONDITION;
 		list_del_init(&cmd->queue_entry);
+		cmd->se_cmd = NULL;
 	} else {
 		list_del_init(&cmd->queue_entry);
 		idr_remove(&udev->commands, id);
@@ -2022,6 +2026,7 @@ static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level)
 
 		idr_remove(&udev->commands, i);
 		if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
+			WARN_ON(!cmd->se_cmd);
 			list_del_init(&cmd->queue_entry);
 			if (err_level == 1) {
 				/*