CVE ID:	CVE-2024-26982
Description:	In the Linux kernel, the following vulnerability has been resolved: Squashfs: check the inode number is not the invalid value of zero Syskiller has produced an out of bounds access in fill_meta_index(). That out of bounds access is ultimately caused because the inode has an inode number with the invalid value of zero, which was not checked. The reason this causes the out of bounds access is due to following sequence of events: 1. Fill_meta_index() is called to allocate (via empty_meta_index()) and fill a metadata index. It however suffers a data read error and aborts, invalidating the newly returned empty metadata index. It does this by setting the inode number of the index to zero, which means unused (zero is not a valid inode number). 2. When fill_meta_index() is subsequently called again on another read operation, locate_meta_index() returns the previous index because it matches the inode number of 0. Because this index has been returned it is expected to have been filled, and because it hasn't been, an out of bounds access is performed. This patch adds a sanity check which checks that the inode number is not zero when the inode is created and returns -EINVAL if it is. [phillip@squashfs.org.uk: whitespace fix] Link: https://lkml.kernel.org/r/20240409204723.446925-1-phillip@squash fs.org.uk
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2024-26982 https://git.kernel.org/stable/c/7def00ebc9f2d6a581ddf46ce4541f84a10680e5 https://git.kernel.org/stable/c/7def00ebc9f2d6a581ddf46ce4541f84a10680e5 https://git.kernel.org/stable/c/9253c54e01b6505d348afbc02abaa4d9f8a01395 https://git.kernel.org/stable/c/9253c54e01b6505d348afbc02abaa4d9f8a01395 https://git.kernel.org/stable/c/be383effaee3d89034f0828038f95065b518772e https://git.kernel.org/stable/c/be383effaee3d89034f0828038f95065b518772e