linux-kernel - Re: [syzbot] [btrfs?] KASAN: slab-out-of-bounds Read in getname

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Message-ID: <tencent_BDD63DCB3762971636DA4B4474F177116609@qq.com>
Date: Tue, 16 Jan 2024 07:32:10 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+33f23b49ac24f986c9e8@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [btrfs?] KASAN: slab-out-of-bounds Read in getname_kernel (2)

please test slab-out-of-bounds Read in getname_kernel

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 3bd7d7488169

diff --git a/fs/btrfs/dev-replace.c b/fs/btrfs/dev-replace.c
index 1502d664c892..58ffaede8d16 100644
--- a/fs/btrfs/dev-replace.c
+++ b/fs/btrfs/dev-replace.c
@@ -741,6 +741,8 @@ int btrfs_dev_replace_by_ioctl(struct btrfs_fs_info *fs_info,
 	if ((args->start.srcdevid == 0 && args->start.srcdev_name[0] == '\0') ||
 	    args->start.tgtdev_name[0] == '\0')
 		return -EINVAL;
+	args->start.srcdev_name[BTRFS_PATH_NAME_MAX] = 0;
+	args->start.tgtdev_name[BTRFS_PATH_NAME_MAX] = 0;
 
 	ret = btrfs_dev_replace_start(fs_info, args->start.tgtdev_name,
 					args->start.srcdevid,