target: Convert inquiry temporary buffer to heap memory

This patch converts the temporary buffer in spc_emulate_inquiry() to
use dynamically allocated memory, instead of local stack memory.

Also bump SE_INQUIRY_BUF up to 1024 bytes to be safe when handling
multiple large SCSI name descriptors for EVPD=0x83.

Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index f9889fd..279d260 100644 (file)
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -697,11 +697,15 @@ spc_emulate_inquiry(struct se_cmd *cmd)
        struct se_portal_group *tpg = cmd->se_lun->lun_sep->sep_tpg;
        unsigned char *rbuf;
        unsigned char *cdb = cmd->t_task_cdb;
-       unsigned char buf[SE_INQUIRY_BUF];
+       unsigned char *buf;
        sense_reason_t ret;
        int p;
 
-       memset(buf, 0, SE_INQUIRY_BUF);
+       buf = kzalloc(SE_INQUIRY_BUF, GFP_KERNEL);
+       if (!buf) {
+               pr_err("Unable to allocate response buffer for INQUIRY\n");
+               return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+       }
 
        if (dev == tpg->tpg_virt_lun0.lun_se_dev)
                buf[0] = 0x3f; /* Not connected */
@@ -734,9 +738,10 @@ spc_emulate_inquiry(struct se_cmd *cmd)
 out:
        rbuf = transport_kmap_data_sg(cmd);
        if (rbuf) {
-               memcpy(rbuf, buf, min_t(u32, sizeof(buf), cmd->data_length));
+               memcpy(rbuf, buf, min_t(u32, SE_INQUIRY_BUF, cmd->data_length));
                transport_kunmap_data_sg(cmd);
        }
+       kfree(buf);
 
        if (!ret)
                target_complete_cmd(cmd, GOOD);

diff --git a/include/target/target_core_base.h b/include/target/target_core_base.h
index 1ba19a4..dd87ab4 100644 (file)
--- a/include/target/target_core_base.h
+++ b/include/target/target_core_base.h
@@ -112,7 +112,7 @@
 /* Queue Algorithm Modifier default for restricted reordering in control mode page */
 #define DA_EMULATE_REST_REORD                  0
 
-#define SE_INQUIRY_BUF                         768
+#define SE_INQUIRY_BUF                         1024
 #define SE_MODE_PAGE_BUF                       512
 #define SE_SENSE_BUF                           96