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Date: Mon, 25 Mar 2024 10:16:41 +0100 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2021-47165: drm/meson: fix shutdown crash when component not probed Description =========== In the Linux kernel, the following vulnerability has been resolved: drm/meson: fix shutdown crash when component not probed When main component is not probed, by example when the dw-hdmi module is not loaded yet or in probe defer, the following crash appears on shutdown: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000038 .. pc : meson_drv_shutdown+0x24/0x50 lr : platform_drv_shutdown+0x20/0x30 .. Call trace: meson_drv_shutdown+0x24/0x50 platform_drv_shutdown+0x20/0x30 device_shutdown+0x158/0x360 kernel_restart_prepare+0x38/0x48 kernel_restart+0x18/0x68 __do_sys_reboot+0x224/0x250 __arm64_sys_reboot+0x24/0x30 .. Simply check if the priv struct has been allocated before using it. The Linux kernel CVE team has assigned CVE-2021-47165 to this issue. Affected and fixed versions =========================== Issue introduced in 4.14.226 with commit 8a5160cc8488 and fixed in 4.14.235 with commit b4298d33c1fc Issue introduced in 4.19.181 with commit 8fbbf2b38494 and fixed in 4.19.193 with commit e256a0eb43e1 Issue introduced in 5.4.106 with commit d2100ef32a8c and fixed in 5.4.124 with commit 4ce2bf20b4a6 Issue introduced in 5.10.24 with commit d4ec1ffbdaa8 and fixed in 5.10.42 with commit d66083c0d6f5 Issue introduced in 5.12 with commit fa0c16caf3d7 and fixed in 5.12.9 with commit b4b91033a0b1 Issue introduced in 5.12 with commit fa0c16caf3d7 and fixed in 5.13 with commit 7cfc4ea78fc1 Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2021-47165 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/gpu/drm/meson/meson_drv.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/b4298d33c1fcce511ffe84d8d3de07e220300f9b https://git.kernel.org/stable/c/e256a0eb43e17209e347409a80805b1659398d68 https://git.kernel.org/stable/c/4ce2bf20b4a6e307e114847d60b2bf40a6a1fac0 https://git.kernel.org/stable/c/d66083c0d6f5125a4d982aa177dd71ab4cd3d212 https://git.kernel.org/stable/c/b4b91033a0b11fe9ade58156cd9168f89f4a8c1a https://git.kernel.org/stable/c/7cfc4ea78fc103ea51ecbacd9236abb5b1c490d2
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