CVE-2024-50156 Information

Description

In the Linux kernel the following vulnerability has been resolved:

drm/msm: Avoid NULL dereference in msm_disp_state_print_regs()

If the allocation in msm_disp_state_dump_regs() failed then block->state can be NULL. The msm_disp_state_print_regs() function does have code to try to handle it with:

if (reg) dump_addr = reg;

…but since \dump_addr\ is initialized to NULL the above is actually a noop. The code then goes on to dereference dump_addr.

Make the function print \Registers not stored\ when it sees a NULL to solve this. Since we’re touching the code fix msm_disp_state_print_regs() not to pointlessly take a double-pointer and properly mark the pointer as const.

Patchwork: https://patchwork.freedesktop.org/patch/619657/

Reference

https://git.kernel.org/stable/c/42cf045086feae77b212f0f66e742b91a5b566b7 https://git.kernel.org/stable/c/e8e9f2a12a6214080c8ea83220a596f6e1dedc6c https://git.kernel.org/stable/c/f7ad916273483748582d97cfa31054ccb19224f3 https://git.kernel.org/stable/c/563aa81fd66a4e7e6e551a0e02bcc23957cafe2f https://git.kernel.org/stable/c/293f53263266bc4340d777268ab4328a97f041fa