There is a null-ptr-deref issue reported by kasan:
BUG: KASAN: null-ptr-deref in target_alloc_device+0xbc4/0xbe0 [target_core_mod]
...
kasan_report+0xb9/0xf0
target_alloc_device+0xbc4/0xbe0 [target_core_mod]
core_dev_setup_virtual_lun0+0xef/0x1f0 [target_core_mod]
target_core_init_configfs+0x205/0x420 [target_core_mod]
do_one_initcall+0xdd/0x4e0
...
entry_SYSCALL_64_after_hwframe+0x76/0x7e
In target_alloc_device(), if allocing memory for dev queues fails,
then dev will be freed by dev->transport->free_device(), but
dev->transport is not initialized at that time, which will lead to a
null pointer reference problem.
Fixing this bug by freeing dev with hba->backend->ops->free_device().
Fixes: 1526d9f10c61 ("scsi: target: Make state_list per CPU")
Signed-off-by: Wang Hai <wanghai38@xxxxxxxxxx>
---
drivers/target/target_core_device.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index bf4892544cfd..bb84d304b07e 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -691,7 +691,7 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
dev->queues = kcalloc(nr_cpu_ids, sizeof(*dev->queues), GFP_KERNEL);
if (!dev->queues) {
- dev->transport->free_device(dev);
+ hba->backend->ops->free_device(dev);
return NULL;
}
--
2.17.1
