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/

kernel.org https://git.kernel.org/stable/c/293f53263266bc4340d777268ab4328a97f041fa [No types assigned]

kernel.org https://git.kernel.org/stable/c/42cf045086feae77b212f0f66e742b91a5b566b7 [No types assigned]

kernel.org https://git.kernel.org/stable/c/563aa81fd66a4e7e6e551a0e02bcc23957cafe2f [No types assigned]

kernel.org https://git.kernel.org/stable/c/e8e9f2a12a6214080c8ea83220a596f6e1dedc6c [No types assigned]

kernel.org https://git.kernel.org/stable/c/f7ad916273483748582d97cfa31054ccb19224f3 [No types assigned]