linux-kernel - Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in folio

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Message-ID: <tencent_85066049912EFAEED3CC8D67C146C112EA06@qq.com>
Date: Sun, 15 Dec 2024 13:59:42 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+4c7590f1cee06597e43a@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] KASAN: slab-use-after-free Read in folio_evictable (3)

#syz test

diff --git a/fs/gfs2/ops_fstype.c b/fs/gfs2/ops_fstype.c
index e83d293c3614..a87c1d5547e5 100644
--- a/fs/gfs2/ops_fstype.c
+++ b/fs/gfs2/ops_fstype.c
@@ -839,6 +839,8 @@ static int init_journal(struct gfs2_sbd *sdp, int undo)
 	    gfs2_holder_initialized(&sdp->sd_jinode_gh))
 		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
 fail_journal_gh:
+	cancel_delayed_work(&sdp->sd_rename_gl->gl_work);
+	cancel_delayed_work(&sdp->sd_freeze_gl->gl_work);
 	if (!sdp->sd_args.ar_spectator &&
 	    gfs2_holder_initialized(&sdp->sd_journal_gh))
 		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 042329b74c6e..3dcef4bb0427 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -222,6 +222,7 @@ static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
 	bool need_free = false;
 	int ret;
 	struct sbitmap sb_backup;
+	unsigned int flags;
 
 	depth = min_t(unsigned int, depth, scsi_device_max_queue_depth(sdev));
 
@@ -243,10 +244,12 @@ static int scsi_realloc_sdev_budget_map(struct scsi_device *sdev,
 		blk_mq_freeze_queue(sdev->request_queue);
 		sb_backup = sdev->budget_map;
 	}
+	flags = memalloc_nofs_save();
 	ret = sbitmap_init_node(&sdev->budget_map,
 				scsi_device_max_queue_depth(sdev),
 				new_shift, GFP_KERNEL,
 				sdev->request_queue->node, false, true);
+	memalloc_nofs_restore(flags);
 	if (!ret)
 		sbitmap_resize(&sdev->budget_map, depth);