linux-kernel - Re: [syzbot] Re: UBSAN: array-index-out-of-bounds in inline_xattr

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Message-ID: <676554f7.050a0220.1333dc.00cf.GAE@google.com>
Date: Fri, 20 Dec 2024 03:28:55 -0800
From: syzbot <syzbot+e4876215632c2d23b481@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] Re: UBSAN: array-index-out-of-bounds in inline_xattr_addr()

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***

Subject: Re: UBSAN: array-index-out-of-bounds in inline_xattr_addr()
Author: dmantipov@...dex.ru

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux d6ab634f1b323db6639b8b776f5d95ae747b342a

diff --git a/fs/f2fs/inode.c b/fs/f2fs/inode.c
index 282fd320bdb3..3061cf69a7fb 100644
--- a/fs/f2fs/inode.c
+++ b/fs/f2fs/inode.c
@@ -302,15 +302,7 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
 				  F2FS_TOTAL_EXTRA_ATTR_SIZE);
 			return false;
 		}
-		if (f2fs_sb_has_flexible_inline_xattr(sbi) &&
-			f2fs_has_inline_xattr(inode) &&
-			(!fi->i_inline_xattr_size ||
-			fi->i_inline_xattr_size > MAX_INLINE_XATTR_SIZE)) {
-			f2fs_warn(sbi, "%s: inode (ino=%lx) has corrupted i_inline_xattr_size: %d, max: %lu",
-				  __func__, inode->i_ino, fi->i_inline_xattr_size,
-				  MAX_INLINE_XATTR_SIZE);
-			return false;
-		}
+
 		if (f2fs_sb_has_compression(sbi) &&
 			fi->i_flags & F2FS_COMPR_FL &&
 			F2FS_FITS_IN_INODE(ri, fi->i_extra_isize,
@@ -320,6 +312,16 @@ static bool sanity_check_inode(struct inode *inode, struct page *node_page)
 		}
 	}
 
+	if (f2fs_sb_has_flexible_inline_xattr(sbi) &&
+	    f2fs_has_inline_xattr(inode) &&
+	    (!fi->i_inline_xattr_size ||
+	     fi->i_inline_xattr_size > MAX_INLINE_XATTR_SIZE)) {
+		f2fs_warn(sbi, "%s: inode (ino=%lx) has corrupted i_inline_xattr_size: %d, max: %lu",
+			  __func__, inode->i_ino, fi->i_inline_xattr_size,
+			  MAX_INLINE_XATTR_SIZE);
+		return false;
+	}
+
 	if (!f2fs_sb_has_extra_attr(sbi)) {
 		if (f2fs_sb_has_project_quota(sbi)) {
 			f2fs_warn(sbi, "%s: corrupted inode ino=%lx, wrong feature flag: %u, run fsck to fix.",