linux-kernel - Re: [syzbot] [nilfs?] UBSAN: array-index-out-of-bounds in nilfs_add

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Date: Mon, 15 Apr 2024 22:28:28 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+2e22057de05b9f3b30d8@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [nilfs?] UBSAN: array-index-out-of-bounds in nilfs_add_link

please test array-index-out-of-bounds in nilfs_add_link

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 0bbac3facb5d

diff --git a/fs/nilfs2/dir.c b/fs/nilfs2/dir.c
index bc846b904b68..aee40db7a036 100644
--- a/fs/nilfs2/dir.c
+++ b/fs/nilfs2/dir.c
@@ -240,7 +240,7 @@ nilfs_filetype_table[NILFS_FT_MAX] = {
 
 #define S_SHIFT 12
 static unsigned char
-nilfs_type_by_mode[S_IFMT >> S_SHIFT] = {
+nilfs_type_by_mode[(S_IFMT >> S_SHIFT) + 1] = {
        [S_IFREG >> S_SHIFT]    = NILFS_FT_REG_FILE,
        [S_IFDIR >> S_SHIFT]    = NILFS_FT_DIR,
        [S_IFCHR >> S_SHIFT]    = NILFS_FT_CHRDEV,
--