ghsa-969w-fmcp-j8rq
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read
In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid
corruption test") the function connector_bad_edid() started assuming
that the memory for the EDID passed to it was big enough to hold
edid[0x7e] + 1
blocks of data (1 extra for the base block). It
completely ignored the fact that the function was passed num_blocks
which indicated how much memory had been allocated for the EDID.
Let's fix this by adding a bounds check.
This is important for handling the case where there's an error in the
first block of the EDID. In that case we will call
connector_bad_edid() without having re-allocated memory based on
edid[0x7e]
.
{ "affected": [], "aliases": [ "CVE-2021-47444" ], "database_specific": { "cwe_ids": [], "github_reviewed": false, "github_reviewed_at": null, "nvd_published_at": "2024-05-22T07:15:09Z", "severity": null }, "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndrm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read\n\nIn commit e11f5bd8228f (\"drm: Add support for DP 1.4 Compliance edid\ncorruption test\") the function connector_bad_edid() started assuming\nthat the memory for the EDID passed to it was big enough to hold\n`edid[0x7e] + 1` blocks of data (1 extra for the base block). It\ncompletely ignored the fact that the function was passed `num_blocks`\nwhich indicated how much memory had been allocated for the EDID.\n\nLet\u0027s fix this by adding a bounds check.\n\nThis is important for handling the case where there\u0027s an error in the\nfirst block of the EDID. In that case we will call\nconnector_bad_edid() without having re-allocated memory based on\n`edid[0x7e]`.", "id": "GHSA-969w-fmcp-j8rq", "modified": "2024-05-22T09:31:45Z", "published": "2024-05-22T09:31:45Z", "references": [ { "type": "ADVISORY", "url": "https://nvd.nist.gov/vuln/detail/CVE-2021-47444" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/09f3946bb452918dbfb1982add56f9ffaae393dc" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/97794170b696856483f74b47bfb6049780d2d3a0" }, { "type": "WEB", "url": "https://git.kernel.org/stable/c/a7b45024f66f9ec769e8dbb1a51ae83cd05929c7" } ], "schema_version": "1.4.0", "severity": [] }
Sightings
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