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| author | Shang XiaoJing <shangxiaojing@huawei.com> | 2022-11-18 10:16:51 +0800 |
|---|---|---|
| committer | Thomas Zimmermann <tzimmermann@suse.de> | 2022-11-21 17:01:16 +0100 |
| commit | 834c23e4f798dcdc8af251b3c428ceef94741991 (patch) | |
| tree | 6aacaf8eb7ceb9bd8e911815df5f8b5a6aaa457d /drivers/gpu/drm/drm_mode_config.c | |
| parent | 7df34a619f59439f38e56d389df02ee7e9e8cc97 (diff) | |
| download | linux-834c23e4f798dcdc8af251b3c428ceef94741991.tar.gz linux-834c23e4f798dcdc8af251b3c428ceef94741991.tar.bz2 linux-834c23e4f798dcdc8af251b3c428ceef94741991.zip | |
drm: Fix potential null-ptr-deref due to drmm_mode_config_init()
drmm_mode_config_init() will call drm_mode_create_standard_properties()
and won't check the ret value. When drm_mode_create_standard_properties()
failed due to alloc, property will be a NULL pointer and may causes the
null-ptr-deref. Fix the null-ptr-deref by adding the ret value check.
Found null-ptr-deref while testing insert module bochs:
general protection fault, probably for non-canonical address
0xdffffc000000000c: 0000 [#1] SMP KASAN PTI
KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]
CPU: 3 PID: 249 Comm: modprobe Not tainted 6.1.0-rc1+ #364
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS
rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014
RIP: 0010:drm_object_attach_property+0x73/0x3c0 [drm]
Call Trace:
<TASK>
__drm_connector_init+0xb6c/0x1100 [drm]
bochs_pci_probe.cold.11+0x4cb/0x7fe [bochs]
pci_device_probe+0x17d/0x340
really_probe+0x1db/0x5d0
__driver_probe_device+0x1e7/0x250
driver_probe_device+0x4a/0x120
__driver_attach+0xcd/0x2c0
bus_for_each_dev+0x11a/0x1b0
bus_add_driver+0x3d7/0x500
driver_register+0x18e/0x320
do_one_initcall+0xc4/0x3e0
do_init_module+0x1b4/0x630
load_module+0x5dca/0x7230
__do_sys_finit_module+0x100/0x170
do_syscall_64+0x3f/0x90
entry_SYSCALL_64_after_hwframe+0x63/0xcd
RIP: 0033:0x7ff65af9f839
Fixes: 6b4959f43a04 ("drm/atomic: atomic plane properties")
Signed-off-by: Shang XiaoJing <shangxiaojing@huawei.com>
Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20221118021651.2460-1-shangxiaojing@huawei.com
Diffstat (limited to 'drivers/gpu/drm/drm_mode_config.c')
| -rw-r--r-- | drivers/gpu/drm/drm_mode_config.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_mode_config.c b/drivers/gpu/drm/drm_mode_config.c index 688c8afe0bf1..8525ef851540 100644 --- a/drivers/gpu/drm/drm_mode_config.c +++ b/drivers/gpu/drm/drm_mode_config.c @@ -399,6 +399,8 @@ static void drm_mode_config_init_release(struct drm_device *dev, void *ptr) */ int drmm_mode_config_init(struct drm_device *dev) { + int ret; + mutex_init(&dev->mode_config.mutex); drm_modeset_lock_init(&dev->mode_config.connection_mutex); mutex_init(&dev->mode_config.idr_mutex); @@ -420,7 +422,11 @@ int drmm_mode_config_init(struct drm_device *dev) init_llist_head(&dev->mode_config.connector_free_list); INIT_WORK(&dev->mode_config.connector_free_work, drm_connector_free_work_fn); - drm_mode_create_standard_properties(dev); + ret = drm_mode_create_standard_properties(dev); + if (ret) { + drm_mode_config_cleanup(dev); + return ret; + } /* Just to be sure */ dev->mode_config.num_fb = 0; |