kernel: ext4: fix double brelse() the buffer of the extents path

A flaw was found in the Linux kernel's ext4 filesystem. This flaw occurs due to a double brelse operation on a buffer in the extents path, meaning the same memory buffer is released twice. An attacker with administrative root privileges could exploit this vulnerability, leading to a system crash...

UBUNTU-CVE-2024-49881

In the Linux kernel, the following vulnerability has been resolved: ext4: update origpath in ext4findextent In ext4findextent, if the path is not big enough, we free it and set origpath to NULL. But after reallocating and successfully initializing the path, we don't update origpath, in which case...

CVE-2024-49882 ext4: fix double brelse() the buffer of the extents path

In the Linux kernel, the following vulnerability has been resolved: ext4: fix double brelse the buffer of the extents path In ext4exttrytomergeup, set path1.pbh to NULL after it has been released, otherwise it may be released twice. An example of what triggers this is as follows: split2 map split...