CVE-2026-43294

In the Linux kernel, the following vulnerability has been resolved:

drm: renesas: rz-du: mipi_dsi: fix kernel panic when rebooting for some panels

Since commit 56de5e305d4b ("clk: renesas: r9a07g044: Add MSTOP for RZ/G2L") we may get the following kernel panic, for some panels, when rebooting:

systemd-shutdown[1]: Rebooting. Call trace: ... doserror+0x28/0x68 el1h64errorhandler+0x34/0x50 el1h64error+0x6c/0x70 rzg2lmipidsihosttransfer+0x114/0x458 (P) mipidsidevicetransfer+0x44/0x58 mipidsidcssetdisplayoffmulti+0x9c/0xc4 ili9881cunprepare+0x38/0x88 drmpanelunprepare+0xbc/0x108

This happens for panels that need to send MIPI-DSI commands in their unprepare() callback. Since the MIPI-DSI interface is stopped at that point, rzg2lmipidsihosttransfer() triggers the kernel panic.

Fix by moving rzg2lmipidsistop() to new callback function rzg2lmipidsiatomicpostdisable().

With this change we now have the correct power-down/stop sequence:

systemd-shutdown[1]: Rebooting. rzg2l-mipi-dsi 10850000.dsi: rzg2lmipidsiatomicdisable(): entry ili9881c-dsi 10850000.dsi.0: ili9881cunprepare(): entry rzg2l-mipi-dsi 10850000.dsi: rzg2lmipidsiatomicpostdisable(): entry reboot: Restarting system