| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2024-35921: media: mediatek: vcodec: Fix oops when HEVC init fails |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| media: mediatek: vcodec: Fix oops when HEVC init fails |
| |
| The stateless HEVC decoder saves the instance pointer in the context |
| regardless if the initialization worked or not. This caused a use after |
| free, when the pointer is freed in case of a failure in the deinit |
| function. |
| Only store the instance pointer when the initialization was successful, |
| to solve this issue. |
| |
| Hardware name: Acer Tomato (rev3 - 4) board (DT) |
| pstate: 80400009 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) |
| pc : vcodec_vpu_send_msg+0x4c/0x190 [mtk_vcodec_dec] |
| lr : vcodec_send_ap_ipi+0x78/0x170 [mtk_vcodec_dec] |
| sp : ffff80008750bc20 |
| x29: ffff80008750bc20 x28: ffff1299f6d70000 x27: 0000000000000000 |
| x26: 0000000000000000 x25: 0000000000000000 x24: 0000000000000000 |
| x23: ffff80008750bc98 x22: 000000000000a003 x21: ffffd45c4cfae000 |
| x20: 0000000000000010 x19: ffff1299fd668310 x18: 000000000000001a |
| x17: 000000040044ffff x16: ffffd45cb15dc648 x15: 0000000000000000 |
| x14: ffff1299c08da1c0 x13: ffffd45cb1f87a10 x12: ffffd45cb2f5fe80 |
| x11: 0000000000000001 x10: 0000000000001b30 x9 : ffffd45c4d12b488 |
| x8 : 1fffe25339380d81 x7 : 0000000000000001 x6 : ffff1299c9c06c00 |
| x5 : 0000000000000132 x4 : 0000000000000000 x3 : 0000000000000000 |
| x2 : 0000000000000010 x1 : ffff80008750bc98 x0 : 0000000000000000 |
| Call trace: |
| vcodec_vpu_send_msg+0x4c/0x190 [mtk_vcodec_dec] |
| vcodec_send_ap_ipi+0x78/0x170 [mtk_vcodec_dec] |
| vpu_dec_deinit+0x1c/0x30 [mtk_vcodec_dec] |
| vdec_hevc_slice_deinit+0x30/0x98 [mtk_vcodec_dec] |
| vdec_if_deinit+0x38/0x68 [mtk_vcodec_dec] |
| mtk_vcodec_dec_release+0x20/0x40 [mtk_vcodec_dec] |
| fops_vcodec_release+0x64/0x118 [mtk_vcodec_dec] |
| v4l2_release+0x7c/0x100 |
| __fput+0x80/0x2d8 |
| __fput_sync+0x58/0x70 |
| __arm64_sys_close+0x40/0x90 |
| invoke_syscall+0x50/0x128 |
| el0_svc_common.constprop.0+0x48/0xf0 |
| do_el0_svc+0x24/0x38 |
| el0_svc+0x38/0xd8 |
| el0t_64_sync_handler+0xc0/0xc8 |
| el0t_64_sync+0x1a8/0x1b0 |
| Code: d503201f f9401660 b900127f b900227f (f9400400) |
| |
| The Linux kernel CVE team has assigned CVE-2024-35921 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 6.5 with commit 2674486aac7d9c95ceb77daf7c30f862d4295c1c and fixed in 6.6.27 with commit ec25fc3c2c1e8958a51abcfed614f81446d918c4 |
| Issue introduced in 6.5 with commit 2674486aac7d9c95ceb77daf7c30f862d4295c1c and fixed in 6.8.6 with commit 521ce0ea7418298d754494fe53263c23c4c78a8e |
| Issue introduced in 6.5 with commit 2674486aac7d9c95ceb77daf7c30f862d4295c1c and fixed in 6.9 with commit 97c75ee5de060d271d80109b0c47cb6008439e5b |
| |
| 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-2024-35921 |
| 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/media/platform/mediatek/vcodec/decoder/vdec/vdec_hevc_req_multi_if.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/ec25fc3c2c1e8958a51abcfed614f81446d918c4 |
| https://git.kernel.org/stable/c/521ce0ea7418298d754494fe53263c23c4c78a8e |
| https://git.kernel.org/stable/c/97c75ee5de060d271d80109b0c47cb6008439e5b |
