CVE-2021-47444

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> drm/edid: In connector_bad_edid() cap num_of_ext by num_blocks read<br /> <br /> In commit e11f5bd8228f ("drm: Add support for DP 1.4 Compliance edid<br /> corruption test") the function connector_bad_edid() started assuming<br /> that the memory for the EDID passed to it was big enough to hold<br /> `edid[0x7e] + 1` blocks of data (1 extra for the base block). It<br /> completely ignored the fact that the function was passed `num_blocks`<br /> which indicated how much memory had been allocated for the EDID.<br /> <br /> Let&amp;#39;s fix this by adding a bounds check.<br /> <br /> This is important for handling the case where there&amp;#39;s an error in the<br /> first block of the EDID. In that case we will call<br /> connector_bad_edid() without having re-allocated memory based on<br /> `edid[0x7e]`.