CVE-2026-23201ceph: fix oops due to invalid pointer for kfree() in parse_longname()

Official description

In the Linux kernel, the following vulnerability has been resolved: ceph: fix oops due to invalid pointer for kfree() in parse_longname() This fixes a kernel oops when reading ceph snapshot directories (.snap), for example by simply running `ls /mnt/my_ceph/.snap`. The variable str is guarded by __free(kfree), but advanced by one for skipping the initial '_' in snapshot names. Thus, kfree() is called with an invalid pointer. This patch removes the need for advancing the pointer so kfree() is called with correct memory pointer. Steps to reproduce: 1. Create snapshots on a cephfs volume (I've 63 snaps in my testcase) 2. Add cephfs mount to fstab $ echo "samba-fileserver@.files=/volumes/datapool/stuff/3461082b-ecc9-4e82-8549-3fd2590d3fb6 /mnt/test/stuff ceph acl,noatime,_netdev 0 0" >> /etc/fstab 3. Reboot the system $ systemctl reboot 4. Check if it's really mounted $ mount | grep stuff 5. List snapshots (expected 63 snapshots on my system) $ ls /mnt/test/stuff/.snap Now ls hangs forever and the kernel log shows the oops.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/c9a129c82ddf82a50b4f8960d2609714ca2dbd26
• https://git.kernel.org/stable/c/8c9af7339de419819cfc641d551675d38ff99abf
• https://git.kernel.org/stable/c/e258ed369c9e04caa7d2fd49785d753ae4034cb6
• https://git.kernel.org/stable/c/bc8dedae022ce3058659c3addef3ec4b41d15e00