| Message ID | 20241011113444.40749-1-wanghai38@huawei.com (mailing list archive) |
|---|---|
| State | Accepted |
| Headers | show |
| Series | scsi: target: core: Fix null-ptr-deref in target_alloc_device() | expand |
On 10/11/24 6:34 AM, Wang Hai wrote: > 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@huawei.com> > --- > 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; > } > Thanks. Reviewed-by: Mike Christie <michael.christie@oracle.com>
On Fri, 11 Oct 2024 19:34:44 +0800, Wang Hai wrote: > 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 > > [...] Applied to 6.12/scsi-fixes, thanks! [1/1] scsi: target: core: Fix null-ptr-deref in target_alloc_device() https://git.kernel.org/mkp/scsi/c/fca6caeb4a61
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; }
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@huawei.com> --- drivers/target/target_core_device.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)