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gfs2_make_fs_rw() to properly handle the withdrawal case where quota initialization succeeds but the filesystem is then withdrawn.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
Product status
b66f723bb552ad59c2acb5d45ea45c890f84498b (git) before e54229ecf49add8451d5f765a32c86ab4446e06c
b66f723bb552ad59c2acb5d45ea45c890f84498b (git) before da6f5bbc2e7902f578b503f2a4c3d8d09ca4b102
2f8623377f3e0cfaa80558631b8694d02a492b4c (git)
c713ebf2fe3f469e4af4de60a3427689ffb7c5d7 (git)
c2191e507147b1a22e9170ebb2aaa0f2902fcbfa (git)
9fc32dad3cdba18669c71893f3e6d96905b39b3f (git)
5.10.173 (semver) before 5.11
5.15.99 (semver) before 5.16
6.1.16 (semver) before 6.2
6.2.3 (semver) before 6.3
6.3
Any version before 6.3
6.19.4 (semver)
7.0 (original_commit_for_fix)
References
git.kernel.org/...c/e54229ecf49add8451d5f765a32c86ab4446e06c
git.kernel.org/...c/da6f5bbc2e7902f578b503f2a4c3d8d09ca4b102