CVE-2026-45961

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quota initialization succeeds but the filesystem is then withdrawn.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