From: Bart Van Assche Date: Tue, 2 Apr 2019 19:58:12 +0000 (-0700) Subject: scsi: target/iscsi: Only send R2T if needed X-Git-Url: http://git.maquefel.me/?a=commitdiff_plain;h=96e8e26dd8dd8a60ef1d0dc3ef0d952ffa70a39f;p=linux.git scsi: target/iscsi: Only send R2T if needed If an initiator submits more immediate data than the size derived from the SCSI CDB, do not send any R2T to the initiator. This scenario is triggered by the libiscsi test ALL.iSCSIResiduals.WriteVerify16Residuals if the iSCSI target driver is modified to discard too large immediate data buffers instead of trying to parse these as an iSCSI PDU. This patch avoids that a negative xfer_len value is passed to iscsit_add_r2t_to_list() if too large immediate data buffers are handled correctly. Cc: Mike Christie Cc: Christoph Hellwig Cc: Hannes Reinecke Cc: Nicholas Bellinger Signed-off-by: Bart Van Assche Signed-off-by: Martin K. Petersen --- diff --git a/drivers/target/iscsi/iscsi_target.c b/drivers/target/iscsi/iscsi_target.c index 5ce6e2a40e00c..828697015759e 100644 --- a/drivers/target/iscsi/iscsi_target.c +++ b/drivers/target/iscsi/iscsi_target.c @@ -3121,6 +3121,12 @@ int iscsit_build_r2ts_for_cmd( else xfer_len = conn->sess->sess_ops->MaxBurstLength; } + + if ((s32)xfer_len < 0) { + cmd->cmd_flags |= ICF_SENT_LAST_R2T; + break; + } + cmd->r2t_offset += xfer_len; if (cmd->r2t_offset == cmd->se_cmd.data_length) diff --git a/drivers/target/iscsi/iscsi_target_util.c b/drivers/target/iscsi/iscsi_target_util.c index 3da062ccd2abf..5b26bc23016a9 100644 --- a/drivers/target/iscsi/iscsi_target_util.c +++ b/drivers/target/iscsi/iscsi_target_util.c @@ -67,6 +67,8 @@ int iscsit_add_r2t_to_list( lockdep_assert_held(&cmd->r2t_lock); + WARN_ON_ONCE((s32)xfer_len < 0); + r2t = kmem_cache_zalloc(lio_r2t_cache, GFP_ATOMIC); if (!r2t) { pr_err("Unable to allocate memory for struct iscsi_r2t.\n");