| 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-2021-47042: drm/amd/display: Free local data after use |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| drm/amd/display: Free local data after use |
| |
| Fixes the following memory leak in dc_link_construct(): |
| |
| unreferenced object 0xffffa03e81471400 (size 1024): |
| comm "amd_module_load", pid 2486, jiffies 4294946026 (age 10.544s) |
| hex dump (first 32 bytes): |
| 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ |
| 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 ................ |
| backtrace: |
| [<000000000bdf5c4a>] kmem_cache_alloc_trace+0x30a/0x4a0 |
| [<00000000e7c59f0e>] link_create+0xce/0xac0 [amdgpu] |
| [<000000002fb6c072>] dc_create+0x370/0x720 [amdgpu] |
| [<000000000094d1f3>] amdgpu_dm_init+0x18e/0x17a0 [amdgpu] |
| [<00000000bec048fd>] dm_hw_init+0x12/0x20 [amdgpu] |
| [<00000000a2bb7cf6>] amdgpu_device_init+0x1463/0x1e60 [amdgpu] |
| [<0000000032d3bb13>] amdgpu_driver_load_kms+0x5b/0x330 [amdgpu] |
| [<00000000a27834f9>] amdgpu_pci_probe+0x192/0x280 [amdgpu] |
| [<00000000fec7d291>] local_pci_probe+0x47/0xa0 |
| [<0000000055dbbfa7>] pci_device_probe+0xe3/0x180 |
| [<00000000815da970>] really_probe+0x1c4/0x4e0 |
| [<00000000b4b6974b>] driver_probe_device+0x62/0x150 |
| [<000000000f9ecc61>] device_driver_attach+0x58/0x60 |
| [<000000000f65c843>] __driver_attach+0xd6/0x150 |
| [<000000002f5e3683>] bus_for_each_dev+0x6a/0xc0 |
| [<00000000a1cfc897>] driver_attach+0x1e/0x20 |
| |
| The Linux kernel CVE team has assigned CVE-2021-47042 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.12 with commit 3a00c04212d1cfe1426338b78f4ead623508c874 and fixed in 5.12.4 with commit 296443139f893b554dddd56a99ba8471ab5802d4 |
| Issue introduced in 5.12 with commit 3a00c04212d1cfe1426338b78f4ead623508c874 and fixed in 5.13 with commit 616cf23b6cf40ad6f03ffbddfa1b6c4eb68d8ae1 |
| |
| 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-2021-47042 |
| 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/amd/display/dc/core/dc_link.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/296443139f893b554dddd56a99ba8471ab5802d4 |
| https://git.kernel.org/stable/c/616cf23b6cf40ad6f03ffbddfa1b6c4eb68d8ae1 |
