Description

In the Linux kernel, the following vulnerability has been resolved: erofs: validate the extent length for uncompressed pclusters syzkaller reported a KASAN use-after-free: https://syzkaller.appspot.com/bug?extid=2ae90e873e97f1faf6f2 The referenced fuzzed image actually has two issues: - m_pa == 0 as a non-inlined pcluster; - The logical length is longer than its physical length. The first issue has already been addressed. This patch addresses the second issue by checking the extent length validity.

References 3

• git.kernel.org https://git.kernel.org/stable/c/40c73b2ea9611b5388807be406f30f5e4e1162da
• git.kernel.org https://git.kernel.org/stable/c/c505feba4c0d76084e56ec498ce819f02a7043ae
• git.kernel.org https://git.kernel.org/stable/c/dc8b6bd587b13b85aff6e9d36cdfcd3f955cac9e

Remediation