tcm_loop: fixup tpgt string to integer conversion

Currently, for example, mkdir "tpgt_xyz" doesn't return error.
mkdir /sys/kernel/config/target/loopback/naa.60014055f195952b/tpgt_xyz

Replace obsoleted simple_strtoul with kstrtoul and check the conversion.

Signed-off-by: Ming Lin <mlin@kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

1 files changed, 6 insertions, 8 deletions

diff --git a/drivers/target/loopback/tcm_loop.c b/drivers/target/loopback/tcm_loop.c
index 797c7315f520..2114c1d2c9de 100644
--- a/drivers/target/loopback/tcm_loop.c
+++ b/drivers/target/loopback/tcm_loop.c
@@ -1216,21 +1216,19 @@ static struct se_portal_group *tcm_loop_make_naa_tpg(
         struct tcm_loop_hba *tl_hba = container_of(wwn,
                         struct tcm_loop_hba, tl_hba_wwn);
         struct tcm_loop_tpg *tl_tpg;
-        char *tpgt_str, *end_ptr;
         int ret;
-        unsigned short int tpgt;
+        unsigned long tpgt;
 
-        tpgt_str = strstr(name, "tpgt_");
-        if (!tpgt_str) {
+        if (strstr(name, "tpgt_") != name) {
                 pr_err("Unable to locate \"tpgt_#\" directory"
                                 " group\n");
                 return ERR_PTR(-EINVAL);
         }
-        tpgt_str += 5; /* Skip ahead of "tpgt_" */
-        tpgt = (unsigned short int) simple_strtoul(tpgt_str, &end_ptr, 0);
+        if (kstrtoul(name+5, 10, &tpgt))
+                return ERR_PTR(-EINVAL);
 
         if (tpgt >= TL_TPGS_PER_HBA) {
-                pr_err("Passed tpgt: %hu exceeds TL_TPGS_PER_HBA:"
+                pr_err("Passed tpgt: %lu exceeds TL_TPGS_PER_HBA:"
                                 " %u\n", tpgt, TL_TPGS_PER_HBA);
                 return ERR_PTR(-EINVAL);
         }
@@ -1247,7 +1245,7 @@ static struct se_portal_group *tcm_loop_make_naa_tpg(
                 return ERR_PTR(-ENOMEM);
 
         pr_debug("TCM_Loop_ConfigFS: Allocated Emulated %s"
-                " Target Port %s,t,0x%04x\n", tcm_loop_dump_proto_id(tl_hba),
+                " Target Port %s,t,0x%04lx\n", tcm_loop_dump_proto_id(tl_hba),
                 config_item_name(&wwn->wwn_group.cg_item), tpgt);
 
         return &tl_tpg->tl_se_tpg;