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

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Message-ID: <tencent_71F8258A8DB0123FDDAB5DE099444F878D07@qq.com>
Date: Sun, 15 Dec 2024 12:48:39 +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/glock.c b/fs/gfs2/glock.c
index 8c4c1f871a88..8f851ecd1625 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -267,6 +267,7 @@ static void __gfs2_glock_put(struct gfs2_glock *gl)
 	lockref_mark_dead(&gl->gl_lockref);
 	spin_unlock(&gl->gl_lockref.lock);
 	gfs2_glock_remove_from_lru(gl);
+	cancel_delayed_work(&gl->gl_work);
 	GLOCK_BUG_ON(gl, !list_empty(&gl->gl_holders));
 	if (mapping) {
 		truncate_inode_pages_final(mapping);
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);