CVE-2022-50556

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm: Fix potential null-ptr-deref due to drmm_mode_config_init()<br /> <br /> drmm_mode_config_init() will call drm_mode_create_standard_properties()<br /> and won&amp;#39;t check the ret value. When drm_mode_create_standard_properties()<br /> failed due to alloc, property will be a NULL pointer and may causes the<br /> null-ptr-deref. Fix the null-ptr-deref by adding the ret value check.<br /> <br /> Found null-ptr-deref while testing insert module bochs:<br /> general protection fault, probably for non-canonical address<br /> 0xdffffc000000000c: 0000 [#1] SMP KASAN PTI<br /> KASAN: null-ptr-deref in range [0x0000000000000060-0x0000000000000067]<br /> CPU: 3 PID: 249 Comm: modprobe Not tainted 6.1.0-rc1+ #364<br /> Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS<br /> rel-1.15.0-0-g2dd4b9b3f840-prebuilt.qemu.org 04/01/2014<br /> RIP: 0010:drm_object_attach_property+0x73/0x3c0 [drm]<br /> Call Trace:<br /> <br /> __drm_connector_init+0xb6c/0x1100 [drm]<br /> bochs_pci_probe.cold.11+0x4cb/0x7fe [bochs]<br /> pci_device_probe+0x17d/0x340<br /> really_probe+0x1db/0x5d0<br /> __driver_probe_device+0x1e7/0x250<br /> driver_probe_device+0x4a/0x120<br /> __driver_attach+0xcd/0x2c0<br /> bus_for_each_dev+0x11a/0x1b0<br /> bus_add_driver+0x3d7/0x500<br /> driver_register+0x18e/0x320<br /> do_one_initcall+0xc4/0x3e0<br /> do_init_module+0x1b4/0x630<br /> load_module+0x5dca/0x7230<br /> __do_sys_finit_module+0x100/0x170<br /> do_syscall_64+0x3f/0x90<br /> entry_SYSCALL_64_after_hwframe+0x63/0xcd<br /> RIP: 0033:0x7ff65af9f839