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:

...

do_serror+0x28/0x68

el1h_64_error_handler+0x34/0x50

el1h_64_error+0x6c/0x70

rzg2l_mipi_dsi_host_transfer+0x114/0x458 (P)

mipi_dsi_device_transfer+0x44/0x58

mipi_dsi_dcs_set_display_off_multi+0x9c/0xc4

ili9881c_unprepare+0x38/0x88

drm_panel_unprepare+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, rzg2l_mipi_dsi_host_transfer() triggers the kernel panic.

Fix by moving rzg2l_mipi_dsi_stop() to new callback function

rzg2l_mipi_dsi_atomic_post_disable().

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

systemd-shutdown[1]: Rebooting.

rzg2l-mipi-dsi 10850000.dsi: rzg2l_mipi_dsi_atomic_disable(): entry

ili9881c-dsi 10850000.dsi.0: ili9881c_unprepare(): entry

rzg2l-mipi-dsi 10850000.dsi: rzg2l_mipi_dsi_atomic_post_disable(): entry

reboot: Restarting system