CVE-2022-50317

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/bridge: megachips: Fix a null pointer dereference bug<br /> <br /> When removing the module we will get the following warning:<br /> <br /> [ 31.911505] i2c-core: driver [stdp2690-ge-b850v3-fw] unregistered<br /> [ 31.912484] general protection fault, probably for non-canonical address 0xdffffc0000000001: 0000 [#1] PREEMPT SMP KASAN PTI<br /> [ 31.913338] KASAN: null-ptr-deref in range [0x0000000000000008-0x000000000000000f]<br /> [ 31.915280] RIP: 0010:drm_bridge_remove+0x97/0x130<br /> [ 31.921825] Call Trace:<br /> [ 31.922533] stdp4028_ge_b850v3_fw_remove+0x34/0x60 [megachips_stdpxxxx_ge_b850v3_fw]<br /> [ 31.923139] i2c_device_remove+0x181/0x1f0<br /> <br /> The two bridges (stdp2690, stdp4028) do not probe at the same time, so<br /> the driver does not call ge_b850v3_resgiter() when probing, causing the<br /> driver to try to remove the object that has not been initialized.<br /> <br /> Fix this by checking whether both the bridges are probed.