linux-kernel - Re: [syzbot] [ext4?] WARNING in ext4_xattr_inode_update

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Message-ID: <20251031015305.1439863-1-lizhi.xu@windriver.com>
Date: Fri, 31 Oct 2025 09:53:05 +0800
From: Lizhi Xu <lizhi.xu@...driver.com>
To: <syzbot+76916a45d2294b551fd9@...kaller.appspotmail.com>
CC: <linux-kernel@...r.kernel.org>, <syzkaller-bugs@...glegroups.com>
Subject: Re: [syzbot] [ext4?] WARNING in ext4_xattr_inode_update_ref (2)

#syz test

diff --git a/fs/ext4/xattr.c b/fs/ext4/xattr.c
index ce7253b3f549..8babe8c344fe 100644
--- a/fs/ext4/xattr.c
+++ b/fs/ext4/xattr.c
@@ -1192,6 +1192,14 @@ ext4_xattr_inode_dec_ref_all(handle_t *handle, struct inode *parent,
 		if (err)
 			continue;
 
+		size_t size = le32_to_cpu(entry->e_value_size);
+		if (i_size_read(ea_inode) != size) {
+			ext4_warning_inode(ea_inode,
+				   "ea_inode file size=%llu entry size=%zu",
+				   i_size_read(ea_inode), size);
+			iput(ea_inode);
+			continue;
+		}
 		err = ext4_expand_inode_array(ea_inode_array, ea_inode);
 		if (err) {
 			ext4_warning_inode(ea_inode,