CVE-2026-45961gfs2: fix memory leaks in gfs2_fill_super error path

Official description

In the Linux kernel, the following vulnerability has been resolved: gfs2: fix memory leaks in gfs2_fill_super error path Fix two memory leaks in the gfs2_fill_super() error handling path when transitioning a filesystem to read-write mode fails. First leak: kthread objects (thread_struct, task_struct, etc.) When gfs2_freeze_lock_shared() fails after init_threads() succeeds, the created kernel threads (logd and quotad) are never destroyed. This occurs because the fail_per_node label doesn't call gfs2_destroy_threads(). Second leak: quota bitmap buffer (8192 bytes) When gfs2_make_fs_rw() fails after gfs2_quota_init() succeeds but before other operations complete, the allocated quota bitmap is never freed. The fix moves thread cleanup to the fail_per_node label to handle all error paths uniformly. gfs2_destroy_threads() is safe to call unconditionally as it checks for NULL pointers. Quota cleanup is added in gfs2_make_fs_rw() to properly handle the withdrawal case where quota initialization succeeds but the filesystem is then withdrawn. Thread leak backtrace (gfs2_freeze_lock_shared failure): unreferenced object 0xffff88801d7bca80 (size 4480): copy_process+0x3a1/0x4670 kernel/fork.c:2422 kernel_clone+0xf3/0x6e0 kernel/fork.c:2779 kthread_create_on_node+0x100/0x150 kernel/kthread.c:478 init_threads+0xab/0x350 fs/gfs2/ops_fstype.c:611 gfs2_fill_super+0xe5c/0x1240 fs/gfs2/ops_fstype.c:1265 Quota leak backtrace (gfs2_make_fs_rw failure): unreferenced object 0xffff88812de7c000 (size 8192): gfs2_quota_init+0xe5/0x820 fs/gfs2/quota.c:1409 gfs2_make_fs_rw+0x7a/0xe0 fs/gfs2/super.c:149 gfs2_fill_super+0xfbb/0x1240 fs/gfs2/ops_fstype.c:1275

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/1fcca0f021ac8e2d19efddb6a733e8b6d4a3fb72
• https://git.kernel.org/stable/c/4db5e4c8f1103b21005ab9e7fe9a5d2554438b74
• https://git.kernel.org/stable/c/d049ba2c1723110f82227eaf521427980811169b
• https://git.kernel.org/stable/c/4456be93464a599eac0eb2afa63b5d662e1599d8
• https://git.kernel.org/stable/c/e54229ecf49add8451d5f765a32c86ab4446e06c
• https://git.kernel.org/stable/c/da6f5bbc2e7902f578b503f2a4c3d8d09ca4b102