linux-kernel - syz test

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Message-ID: <20250418100943.108533-1-contact@arnaud-lcm.com>
Date: Fri, 18 Apr 2025 12:09:43 +0200
From: Arnaud Lecomte <contact@...aud-lcm.com>
To: syzbot+5405d1265a66aa313343@...kaller.appspotmail.com
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: syz test

#syz test
diff --git a/fs/hfs/bnode.c b/fs/hfs/bnode.c
index 6add6ebfef89..e8d7431ce178 100644
--- a/fs/hfs/bnode.c
+++ b/fs/hfs/bnode.c
@@ -15,7 +15,7 @@
 
 #include "btree.h"
 
-void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len)
+int hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len)
 {
 	struct page *page;
 	int pagenum;
@@ -37,13 +37,16 @@ void hfs_bnode_read(struct hfs_bnode *node, void *buf, int off, int len)
 		pagenum++;
 		off = 0; /* page offset only applies to the first page */
 	}
+
+	return bytes_to_read;
 }
 
 u16 hfs_bnode_read_u16(struct hfs_bnode *node, int off)
 {
-	__be16 data;
+	__be16 data = 0;
 	// optimize later...
-	hfs_bnode_read(node, &data, off, 2);
+	if(hfs_bnode_read(node, &data, off, 2) < sizeof(u16))
+		return 0;
 	return be16_to_cpu(data);
 }
 
diff --git a/fs/hfs/btree.h b/fs/hfs/btree.h
index 0e6baee93245..54f310c52643 100644
--- a/fs/hfs/btree.h
+++ b/fs/hfs/btree.h
@@ -94,7 +94,7 @@ extern struct hfs_bnode * hfs_bmap_alloc(struct hfs_btree *);
 extern void hfs_bmap_free(struct hfs_bnode *node);
 
 /* bnode.c */
-extern void hfs_bnode_read(struct hfs_bnode *, void *, int, int);
+extern int hfs_bnode_read(struct hfs_bnode *, void *, int, int);
 extern u16 hfs_bnode_read_u16(struct hfs_bnode *, int);
 extern u8 hfs_bnode_read_u8(struct hfs_bnode *, int);
 extern void hfs_bnode_read_key(struct hfs_bnode *, void *, int);
--