linux-kernel - Re: [syzbot] [hfs?] KMSAN: uninit-value in __hfsplus_ext_cache

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Date: Fri, 29 Dec 2023 06:01:03 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+55ad87f38795d6787521@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [hfs?] KMSAN: uninit-value in __hfsplus_ext_cache_extent

please test uninit-value in __hfsplus_ext_cache_extent

#syz test https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git fbafc3e621c3

diff --git a/fs/hfsplus/bfind.c b/fs/hfsplus/bfind.c
index ca2ba8c9f82e..9d4ffff6d42e 100644
--- a/fs/hfsplus/bfind.c
+++ b/fs/hfsplus/bfind.c
@@ -23,6 +23,7 @@ int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
 		return -ENOMEM;
 	fd->search_key = ptr;
 	fd->key = ptr + tree->max_key_len + 2;
+	fd->key->ext.fork_type = 0;
 	hfs_dbg(BNODE_REFS, "find_init: %d (%p)\n",
 		tree->cnid, __builtin_return_address(0));
 	switch (tree->cnid) {
diff --git a/fs/hfsplus/extents.c b/fs/hfsplus/extents.c
index 3c572e44f2ad..6681e3a24f29 100644
--- a/fs/hfsplus/extents.c
+++ b/fs/hfsplus/extents.c
@@ -206,7 +206,7 @@ static inline int __hfsplus_ext_cache_extent(struct hfs_find_data *fd,
 static int hfsplus_ext_read_extent(struct inode *inode, u32 block)
 {
 	struct hfsplus_inode_info *hip = HFSPLUS_I(inode);
-	struct hfs_find_data fd;
+	struct hfs_find_data fd = { 0 };
 	int res;
 
 	if (block >= hip->cached_start &&