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From: Yuichiro Tsuji <yuichtsu@amazon.com>
To: <syzbot+30c83da54e948f6e9436@syzkaller.appspotmail.com>
Cc: <linux-kernel@vger.kernel.org>, <syzkaller-bugs@googlegroups.com>
Subject: Re: [syzbot] [v9fs?] UBSAN: shift-out-of-bounds in v9fs_get_tree
Date: Fri, 22 Aug 2025 22:31:48 +0900	[thread overview]
Message-ID: <20250822133148.199-1-yuichtsu@amazon.com> (raw)
In-Reply-To: <68a6e577.050a0220.3d78fd.0020.GAE@google.com>

#syz test

diff --git a/fs/9p/vfs_super.c b/fs/9p/vfs_super.c
index 795c6388744c..3947ef762aaa 100644
--- a/fs/9p/vfs_super.c
+++ b/fs/9p/vfs_super.c
@@ -59,7 +59,7 @@ v9fs_fill_super(struct super_block *sb, struct v9fs_session_info *v9ses,

        sb->s_maxbytes = MAX_LFS_FILESIZE;
        sb->s_blocksize_bits = fls(v9ses->maxdata - 1);
-       sb->s_blocksize = 1 << sb->s_blocksize_bits;
+       sb->s_blocksize = BIT(sb->s_blocksize_bits);
        sb->s_magic = V9FS_MAGIC;
        if (v9fs_proto_dotl(v9ses)) {
                sb->s_op = &v9fs_super_ops_dotl;

  reply	other threads:[~2025-08-22 13:32 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-08-21  2:58 syzbot
2025-08-21  3:48 ` Dominique Martinet
2025-08-21  4:06   ` syzbot
2025-09-24 23:14   ` Eric Sandeen
2025-08-21  8:47 ` Hillf Danton
2025-08-21  9:23   ` syzbot
2025-08-22 13:31     ` Yuichiro Tsuji [this message]
2025-08-22 14:56       ` syzbot
2025-08-22 13:45     ` Yuichiro Tsuji
2025-08-22 17:47       ` syzbot
2025-08-22 14:27 ` Edward Adam Davis
2025-08-22 18:05   ` syzbot
2025-08-22 14:41 ` [PATCH next] 9p: Correct the session info Edward Adam Davis
2025-08-22 23:22   ` [PATCH next V2] " Edward Adam Davis
2025-08-23  6:34     ` Dominique Martinet
2025-09-24 22:19       ` Eric Sandeen
2025-09-25  2:17         ` Dominique Martinet
2025-09-25  4:29           ` Eric Sandeen
2025-09-25  7:24             ` Dominique Martinet
2025-09-28  4:00 ` Forwarded: Re: [syzbot] [v9fs?] UBSAN: shift-out-of-bounds in v9fs_get_tree syzbot
2025-09-28 19:04 ` syzbot
     [not found] <87ikh32pm3.fsf@gmail.com>
2025-09-28  4:45 ` syzbot
     [not found] <87h5wm2ybu.fsf@gmail.com>
2025-09-28 20:44 ` syzbot

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