linux-kernel - Re: [syzbot] [exfat?] KASAN: stack-out-of-bounds Read in exfat_nls_to

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Message-Id: <20251006032505.366466-1-aha310510@gmail.com>
Date: Mon,  6 Oct 2025 12:25:05 +0900
From: Jeongjun Park <aha310510@...il.com>
To: syzbot+98cc76a76de46b3714d4@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [exfat?] KASAN: stack-out-of-bounds Read in exfat_nls_to_utf16

#syz test git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master

---
 fs/exfat/nls.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/exfat/nls.c b/fs/exfat/nls.c
index 8243d94ceaf4..a52f3494eb20 100644
--- a/fs/exfat/nls.c
+++ b/fs/exfat/nls.c
@@ -616,7 +616,7 @@ static int exfat_nls_to_ucs2(struct super_block *sb,
 		unilen++;
 	}
 
-	if (p_cstring[i] != '\0')
+	if (p_cstring[min(i, len - 1)] != '\0')
 		lossy |= NLS_NAME_OVERLEN;
 
 	*uniname = '\0';
--