In the Linux kernel, the following vulnerability has been resolved:
drm/panthor: reject firmware sections with oversized data
In panthor_fw_load_section_entry(), the data size to copy is calculated without validating it against the allocated section_size:
section->data.size = hdr.data.end - hdr.data.start;
If a crafted firmware sets data.size larger than the allocated memory, this could cause a heap buffer overflow in panthor_fw_init_section_mem()
memcpy(section->mem->kmap, section->data.buf, section->data.size);
Additionally, if the section->data.size exceeds the BO size, could this memset underflow the size calculation, leading to a massive out-of-bounds zeroing of kernel memory?
memset(section->mem->kmap + section->data.size, 0,
panthor_kernel_bo_size(section->mem) - section->data.size);
Reject section entries whose initial data is larger than the section size.