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Date: Tue, 2 Apr 2024 08:22:24 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org> Subject: CVE-2024-26660: drm/amd/display: Implement bounds check for stream encoder creation in DCN301 Description =========== In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Implement bounds check for stream encoder creation in DCN301 'stream_enc_regs' array is an array of dcn10_stream_enc_registers structures. The array is initialized with four elements, corresponding to the four calls to stream_enc_regs() in the array initializer. This means that valid indices for this array are 0, 1, 2, and 3. The error message 'stream_enc_regs' 4 <= 5 below, is indicating that there is an attempt to access this array with an index of 5, which is out of bounds. This could lead to undefined behavior Here, eng_id is used as an index to access the stream_enc_regs array. If eng_id is 5, this would result in an out-of-bounds access on the stream_enc_regs array. Thus fixing Buffer overflow error in dcn301_stream_encoder_create reported by Smatch: drivers/gpu/drm/amd/amdgpu/../display/dc/resource/dcn301/dcn301_resource.c:1011 dcn301_stream_encoder_create() error: buffer overflow 'stream_enc_regs' 4 <= 5 The Linux kernel CVE team has assigned CVE-2024-26660 to this issue. Affected and fixed versions =========================== Issue introduced in 5.11 with commit 3a83e4e64bb1 and fixed in 5.15.149 with commit 42442f74314d Issue introduced in 5.11 with commit 3a83e4e64bb1 and fixed in 6.1.78 with commit efdd665ce1a1 Issue introduced in 5.11 with commit 3a83e4e64bb1 and fixed in 6.6.17 with commit cd9bd10c59e3 Issue introduced in 5.11 with commit 3a83e4e64bb1 and fixed in 6.7.5 with commit a938eab9586e Issue introduced in 5.11 with commit 3a83e4e64bb1 and fixed in 6.8 with commit 58fca355ad37 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-2024-26660 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/resource/dcn301/dcn301_resource.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/42442f74314d41ddc68227047036fa3e78940054 https://git.kernel.org/stable/c/efdd665ce1a1634b8c1dad5e7f6baaef3e131d0a https://git.kernel.org/stable/c/cd9bd10c59e3c1446680514fd3097c5b00d3712d https://git.kernel.org/stable/c/a938eab9586eea31cfd129a507f552efae14d738 https://git.kernel.org/stable/c/58fca355ad37dcb5f785d9095db5f748b79c5dc2
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