In the Linux kernel, the following vulnerability has been resolved: crypto: ccp - Check for page...

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

crypto: ccp - Check for page allocation failure correctly in TIO

Sashiko notes:

if __snp_alloc_firmware_pages() returns NULL under memory pressure, is it safe to pass it directly to page_address()?

On architectures without HASHED_PAGE_VIRTUAL, page_address(NULL) might compute a deterministic but invalid, non-zero virtual address. The subsequent if (tio_status) check would then evaluate to true, and sev_tsm_init_locked() would dereference the invalid pointer.

Indeed, page_address(NULL) will return non-NULL garbage here. Fix this by checking the page allocation itself for NULL, not the resulting virtual address.