nilfs2: initialize unused bytes in segment summary blocks
authorRyusuke Konishi <konishi.ryusuke@gmail.com>
Mon, 17 Apr 2023 17:35:13 +0000 (02:35 +0900)
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>
Wed, 26 Apr 2023 12:28:39 +0000 (14:28 +0200)
commita0aa4827f79100e23b2614be155a7be5872748b7
treea5c91d5cbd68532fdbb0b794de1ed1c0104c5273
parenta1176791ab74bed2df83e7528fcde16a7c888420
nilfs2: initialize unused bytes in segment summary blocks

commit ef832747a82dfbc22a3702219cc716f449b24e4a upstream.

Syzbot still reports uninit-value in nilfs_add_checksums_on_logs() for
KMSAN enabled kernels after applying commit 7397031622e0 ("nilfs2:
initialize "struct nilfs_binfo_dat"->bi_pad field").

This is because the unused bytes at the end of each block in segment
summaries are not initialized.  So this fixes the issue by padding the
unused bytes with null bytes.

Link: https://lkml.kernel.org/r/20230417173513.12598-1-konishi.ryusuke@gmail.com
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Tested-by: Ryusuke Konishi <konishi.ryusuke@gmail.com>
Reported-by: syzbot+048585f3f4227bb2b49b@syzkaller.appspotmail.com
Link: https://syzkaller.appspot.com/bug?extid=048585f3f4227bb2b49b
Cc: Alexander Potapenko <glider@google.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
fs/nilfs2/segment.c