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/[email protected]

References

• https://nvd.nist.gov/vuln/detail/CVE-2024-46688
• https://git.kernel.org/stable/c/0005e01e1e875c5e27130c5e2ed0189749d1e08a
• https://git.kernel.org/stable/c/49c0e081998008cde0c872c0ff9affa1ece4b878