CVE-2024-46688 Information

Description

In the Linux kernel the following vulnerability has been resolved:

erofs: fix out-of-bound access when z_erofs_gbuf_growsize() partially fails

If z_erofs_gbuf_growsize() partially fails on a global buffer due to memory allocation failure or fault injection (as reported by syzbot [1]) new pages need to be freed by comparing to the existing pages to avoid memory leaks.

However the old gbuf->pages[] array may not be large enough which can lead to null-ptr-deref or out-of-bound access.

Fix this by checking against gbuf->nrpages in advance.

[1] https://lore.kernel.org/r/000000000000f7b96e062018c6e3@google.com

Reference

https://git.kernel.org/stable/c/49c0e081998008cde0c872c0ff9affa1ece4b878 https://git.kernel.org/stable/c/0005e01e1e875c5e27130c5e2ed0189749d1e08a