6.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Julian Sun <sunjunchao2870@xxxxxxxxx> commit 6cb9df81a2c462b89d2f9611009ab43ae8717841 upstream. When gfs2_fill_super() fails, destroy_workqueue() is called within gfs2_gl_hash_clear(), and the subsequent code path calls destroy_workqueue() on the same work queue again. This issue can be fixed by setting the work queue pointer to NULL after the first destroy_workqueue() call and checking for a NULL pointer before attempting to destroy the work queue again. Reported-by: syzbot+d34c2a269ed512c531b0@xxxxxxxxxxxxxxxxxxxxxxxxx Closes: https://syzkaller.appspot.com/bug?extid=d34c2a269ed512c531b0 Fixes: 30e388d57367 ("gfs2: Switch to a per-filesystem glock workqueue") Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Julian Sun <sunjunchao2870@xxxxxxxxx> Signed-off-by: Andreas Gruenbacher <agruenba@xxxxxxxxxx> Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> --- fs/gfs2/glock.c | 1 + fs/gfs2/ops_fstype.c | 3 ++- 2 files changed, 3 insertions(+), 1 deletion(-) --- a/fs/gfs2/glock.c +++ b/fs/gfs2/glock.c @@ -2249,6 +2249,7 @@ void gfs2_gl_hash_clear(struct gfs2_sbd gfs2_free_dead_glocks(sdp); glock_hash_walk(dump_glock_func, sdp); destroy_workqueue(sdp->sd_glock_wq); + sdp->sd_glock_wq = NULL; } static const char *state2str(unsigned state) --- a/fs/gfs2/ops_fstype.c +++ b/fs/gfs2/ops_fstype.c @@ -1307,7 +1307,8 @@ fail_debug: fail_delete_wq: destroy_workqueue(sdp->sd_delete_wq); fail_glock_wq: - destroy_workqueue(sdp->sd_glock_wq); + if (sdp->sd_glock_wq) + destroy_workqueue(sdp->sd_glock_wq); fail_free: free_sbd(sdp); sb->s_fs_info = NULL;
