iscsi-target: Fix residual count hanlding + remove iscsi_cmd->residual_count
This patch fixes iscsi-target handling of underflow where residual data is causing an OOPs by using the incorrect iscsi_cmd_t->data_length initially assigned in iscsit_allocate_se_cmd(). It resets iscsi_cmd_t->data_length from se_cmd_t->data_length after transport_generic_allocate_tasks() has been invoked in iscsit_handle_scsi_cmd() RX context, and converts iscsi_cmd->residual_count usage to access iscsi_cmd->se_cmd.residual_count to get the proper residual count set by target-core. Reported-by: <lists@internyc.net> Cc: Christoph Hellwig <hch@lst.de> Cc: Andy Grover <agrover@redhat.com> Cc: stable@kernel.org Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
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@ -1039,6 +1039,8 @@ done:
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*/
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send_check_condition = 1;
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} else {
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cmd->data_length = cmd->se_cmd.data_length;
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if (iscsit_decide_list_to_build(cmd, payload_length) < 0)
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return iscsit_add_reject_from_cmd(
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ISCSI_REASON_BOOKMARK_NO_RESOURCES,
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@ -2508,10 +2510,10 @@ static int iscsit_send_data_in(
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if (hdr->flags & ISCSI_FLAG_DATA_STATUS) {
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if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
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hdr->flags |= ISCSI_FLAG_DATA_OVERFLOW;
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hdr->residual_count = cpu_to_be32(cmd->residual_count);
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hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
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} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
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hdr->flags |= ISCSI_FLAG_DATA_UNDERFLOW;
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hdr->residual_count = cpu_to_be32(cmd->residual_count);
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hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
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}
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}
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hton24(hdr->dlength, datain.length);
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@ -3013,10 +3015,10 @@ static int iscsit_send_status(
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hdr->flags |= ISCSI_FLAG_CMD_FINAL;
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if (cmd->se_cmd.se_cmd_flags & SCF_OVERFLOW_BIT) {
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hdr->flags |= ISCSI_FLAG_CMD_OVERFLOW;
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hdr->residual_count = cpu_to_be32(cmd->residual_count);
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hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
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} else if (cmd->se_cmd.se_cmd_flags & SCF_UNDERFLOW_BIT) {
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hdr->flags |= ISCSI_FLAG_CMD_UNDERFLOW;
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hdr->residual_count = cpu_to_be32(cmd->residual_count);
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hdr->residual_count = cpu_to_be32(cmd->se_cmd.residual_count);
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}
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hdr->response = cmd->iscsi_response;
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hdr->cmd_status = cmd->se_cmd.scsi_status;
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@ -398,7 +398,6 @@ struct iscsi_cmd {
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u32 pdu_send_order;
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/* Current struct iscsi_pdu in struct iscsi_cmd->pdu_list */
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u32 pdu_start;
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u32 residual_count;
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/* Next struct iscsi_seq to send in struct iscsi_cmd->seq_list */
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u32 seq_send_order;
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/* Number of struct iscsi_seq in struct iscsi_cmd->seq_list */
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