A sufficiently long Unit Serial string, dbroot path, and/or ALUA target
portal group name may result in truncation of the ALUA state file path
prior to usage. Fix this by using kasprintf() instead.
Fixes: fdddf932269a ("target: use new "dbroot" target attribute")
Signed-off-by: David Disseldorp <ddiss@xxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
Changes since v2:
- rework core_alua_update_tpg_primary_metadata() error path, as
suggested by Christoph.
drivers/target/target_core_alua.c | 51 +++++++++++++++++++++------------------
drivers/target/target_core_alua.h | 9 -------
2 files changed, 28 insertions(+), 32 deletions(-)
diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index 928127642574..e46ca968009c 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -918,7 +918,7 @@ static int core_alua_update_tpg_primary_metadata(
{
unsigned char *md_buf;
struct t10_wwn *wwn = &tg_pt_gp->tg_pt_gp_dev->t10_wwn;
- char path[ALUA_METADATA_PATH_LEN];
+ char *path;
int len, rc;
md_buf = kzalloc(ALUA_MD_BUF_LEN, GFP_KERNEL);
@@ -927,8 +927,6 @@ static int core_alua_update_tpg_primary_metadata(
return -ENOMEM;
}
- memset(path, 0, ALUA_METADATA_PATH_LEN);
-
len = snprintf(md_buf, ALUA_MD_BUF_LEN,
"tg_pt_gp_id=%hu\n"
"alua_access_state=0x%02x\n"
@@ -937,11 +935,14 @@ static int core_alua_update_tpg_primary_metadata(
tg_pt_gp->tg_pt_gp_alua_access_state,
tg_pt_gp->tg_pt_gp_alua_access_status);
- snprintf(path, ALUA_METADATA_PATH_LEN,
- "%s/alua/tpgs_%s/%s", db_root, &wwn->unit_serial[0],
- config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
-
- rc = core_alua_write_tpg_metadata(path, md_buf, len);
+ rc = -ENOMEM;
+ path = kasprintf(GFP_KERNEL, "%s/alua/tpgs_%s/%s", db_root,
+ &wwn->unit_serial[0],
+ config_item_name(&tg_pt_gp->tg_pt_gp_group.cg_item));
+ if (path) {
+ rc = core_alua_write_tpg_metadata(path, md_buf, len);
+ kfree(path);
+ }
kfree(md_buf);
return rc;
}
@@ -1209,7 +1210,7 @@ static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
{
struct se_portal_group *se_tpg = lun->lun_tpg;
unsigned char *md_buf;
- char path[ALUA_METADATA_PATH_LEN], wwn[ALUA_SECONDARY_METADATA_WWN_LEN];
+ char *path;
int len, rc;
mutex_lock(&lun->lun_tg_pt_md_mutex);
@@ -1221,28 +1222,32 @@ static int core_alua_update_tpg_secondary_metadata(struct se_lun *lun)
goto out_unlock;
}
- memset(path, 0, ALUA_METADATA_PATH_LEN);
- memset(wwn, 0, ALUA_SECONDARY_METADATA_WWN_LEN);
-
- len = snprintf(wwn, ALUA_SECONDARY_METADATA_WWN_LEN, "%s",
- se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg));
-
- if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL)
- snprintf(wwn+len, ALUA_SECONDARY_METADATA_WWN_LEN-len, "+%hu",
- se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
-
len = snprintf(md_buf, ALUA_MD_BUF_LEN, "alua_tg_pt_offline=%d\n"
"alua_tg_pt_status=0x%02x\n",
atomic_read(&lun->lun_tg_pt_secondary_offline),
lun->lun_tg_pt_secondary_stat);
- snprintf(path, ALUA_METADATA_PATH_LEN, "%s/alua/%s/%s/lun_%llu",
- db_root, se_tpg->se_tpg_tfo->get_fabric_name(), wwn,
- lun->unpacked_lun);
+ if (se_tpg->se_tpg_tfo->tpg_get_tag != NULL) {
+ path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s+%hu/lun_%llu",
+ db_root, se_tpg->se_tpg_tfo->get_fabric_name(),
+ se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
+ se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg),
+ lun->unpacked_lun);
+ } else {
+ path = kasprintf(GFP_KERNEL, "%s/alua/%s/%s/lun_%llu",
+ db_root, se_tpg->se_tpg_tfo->get_fabric_name(),
+ se_tpg->se_tpg_tfo->tpg_get_wwn(se_tpg),
+ lun->unpacked_lun);
+ }
+ if (!path) {
+ rc = -ENOMEM;
+ goto out_free;
+ }
rc = core_alua_write_tpg_metadata(path, md_buf, len);
+ kfree(path);
+out_free:
kfree(md_buf);
-
out_unlock:
mutex_unlock(&lun->lun_tg_pt_md_mutex);
return rc;
diff --git a/drivers/target/target_core_alua.h b/drivers/target/target_core_alua.h
index c69c11baf07f..90643300cd32 100644
--- a/drivers/target/target_core_alua.h
+++ b/drivers/target/target_core_alua.h
@@ -71,15 +71,6 @@
*/
#define ALUA_DEFAULT_IMPLICIT_TRANS_SECS 0
#define ALUA_MAX_IMPLICIT_TRANS_SECS 255
-/*
- * Used by core_alua_update_tpg_primary_metadata() and
- * core_alua_update_tpg_secondary_metadata()
- */
-#define ALUA_METADATA_PATH_LEN 512
-/*
- * Used by core_alua_update_tpg_secondary_metadata()
- */
-#define ALUA_SECONDARY_METADATA_WWN_LEN 256
/* Used by core_alua_update_tpg_(primary,secondary)_metadata */
#define ALUA_MD_BUF_LEN 1024
--
2.13.6
--
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