CVE-2021-47444

In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid corruption test") the function connectorbadedid() 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 connectorbadedid() without having re-allocated memory based on edid[0x7e].

References

Affected packages

Git /

Affected ranges

Database specific

source

"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47444.json"

unresolved_ranges

[
    {
        "events": [
            {
                "introduced": "5.7"
            },
            {
                "fixed": "5.10.75"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "5.11"
            },
            {
                "fixed": "5.14.14"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc1"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc2"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc3"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc4"
            }
        ]
    },
    {
        "events": [
            {
                "introduced": "0"
            },
            {
                "last_affected": "5.15-rc5"
            }
        ]
    }
]