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target: Add missing mapped_lun bounds checking during make_mappedlun setup 

This patch adds missing bounds checking for the configfs provided
mapped_lun value during target_fabric_make_mappedlun() setup ahead
of se_lun_acl initialization.

This addresses a potential OOPs when using a mapped_lun value that
exceeds the hardcoded TRANSPORT_MAX_LUNS_PER_TPG-1 value within
se_node_acl->device_list[].

Reported-by: Jan Engelhardt <jengelh@inai.de>
Cc: Jan Engelhardt <jengelh@inai.de>
Cc: <stable@vger.kernel.org>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Nicholas Bellinger 2013-02-18 18:31:37 -08:00
parent fcf29481fb
commit fbbf8555a9
1 changed files with 8 additions and 0 deletions
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8
drivers/target/target_core_fabric_configfs.c
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@ -354,6 +354,14 @@ static struct config_group *target_fabric_make_mappedlun(
ret = -EINVAL; ret = -EINVAL;
goto out; goto out;
} }
if (mapped_lun > (TRANSPORT_MAX_LUNS_PER_TPG-1)) {
pr_err("Mapped LUN: %lu exceeds TRANSPORT_MAX_LUNS_PER_TPG"
"-1: %u for Target Portal Group: %u\n", mapped_lun,
TRANSPORT_MAX_LUNS_PER_TPG-1,
se_tpg->se_tpg_tfo->tpg_get_tag(se_tpg));
ret = -EINVAL;
goto out;
}
lacl = core_dev_init_initiator_node_lun_acl(se_tpg, se_nacl, lacl = core_dev_init_initiator_node_lun_acl(se_tpg, se_nacl,
mapped_lun, &ret); mapped_lun, &ret);