linux-kernel - [PATCH] hfsplus: fix uninit-value in hfsplus_attr_bin_cmp

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Date: Mon,  4 Mar 2024 13:33:18 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+c6d8e1bffb0970780d5c@...kaller.appspotmail.com
Cc: glider@...gle.com,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: [PATCH] hfsplus: fix uninit-value in hfsplus_attr_bin_cmp_key

[Syzbot reported]
BUG: KMSAN: uninit-value in hfsplus_attr_bin_cmp_key+0xf1/0x190 fs/hfsplus/attributes.c:42
 hfsplus_attr_bin_cmp_key+0xf1/0x190 fs/hfsplus/attributes.c:42
 hfs_find_rec_by_key+0xb0/0x240 fs/hfsplus/bfind.c:100
 __hfsplus_brec_find+0x26b/0x7b0 fs/hfsplus/bfind.c:135
 hfsplus_brec_find+0x445/0x970 fs/hfsplus/bfind.c:195
 hfsplus_find_attr+0x30c/0x390
 hfsplus_attr_exists+0x1c6/0x260 fs/hfsplus/attributes.c:182
 __hfsplus_setxattr+0x510/0x3580 fs/hfsplus/xattr.c:336
 hfsplus_setxattr+0x129/0x1e0 fs/hfsplus/xattr.c:434
 hfsplus_trusted_setxattr+0x55/0x70 fs/hfsplus/xattr_trusted.c:30
 __vfs_setxattr+0x7aa/0x8b0 fs/xattr.c:201
 __vfs_setxattr_noperm+0x24f/0xa30 fs/xattr.c:235
 __vfs_setxattr_locked+0x441/0x480 fs/xattr.c:296
 vfs_setxattr+0x294/0x650 fs/xattr.c:322
 do_setxattr fs/xattr.c:630 [inline]
 setxattr+0x45f/0x540 fs/xattr.c:653
 path_setxattr+0x1f5/0x3c0 fs/xattr.c:672
 __do_sys_setxattr fs/xattr.c:688 [inline]
 __se_sys_setxattr fs/xattr.c:684 [inline]
 __x64_sys_setxattr+0xf7/0x180 fs/xattr.c:684
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

Uninit was created at:
 slab_post_alloc_hook mm/slub.c:3819 [inline]
 slab_alloc_node mm/slub.c:3860 [inline]
 __do_kmalloc_node mm/slub.c:3980 [inline]
 __kmalloc+0x919/0xf80 mm/slub.c:3994
 kmalloc include/linux/slab.h:594 [inline]
 hfsplus_find_init+0x91/0x250 fs/hfsplus/bfind.c:21
 hfsplus_attr_exists+0xde/0x260 fs/hfsplus/attributes.c:178
 __hfsplus_setxattr+0x510/0x3580 fs/hfsplus/xattr.c:336
 hfsplus_setxattr+0x129/0x1e0 fs/hfsplus/xattr.c:434
 hfsplus_trusted_setxattr+0x55/0x70 fs/hfsplus/xattr_trusted.c:30
 __vfs_setxattr+0x7aa/0x8b0 fs/xattr.c:201
 __vfs_setxattr_noperm+0x24f/0xa30 fs/xattr.c:235
 __vfs_setxattr_locked+0x441/0x480 fs/xattr.c:296
 vfs_setxattr+0x294/0x650 fs/xattr.c:322
 do_setxattr fs/xattr.c:630 [inline]
 setxattr+0x45f/0x540 fs/xattr.c:653
 path_setxattr+0x1f5/0x3c0 fs/xattr.c:672
 __do_sys_setxattr fs/xattr.c:688 [inline]
 __se_sys_setxattr fs/xattr.c:684 [inline]
 __x64_sys_setxattr+0xf7/0x180 fs/xattr.c:684
 do_syscall_x64 arch/x86/entry/common.c:52 [inline]
 do_syscall_64+0xcf/0x1e0 arch/x86/entry/common.c:83
 entry_SYSCALL_64_after_hwframe+0x63/0x6b

[Fix]
Let's clear all search_key fields at alloc time.

Reported-and-tested-by: syzbot+c6d8e1bffb0970780d5c@...kaller.appspotmail.com
Signed-off-by: Edward Adam Davis <eadavis@...com>
---
 fs/hfsplus/bfind.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/fs/hfsplus/bfind.c b/fs/hfsplus/bfind.c
index ca2ba8c9f82e..b939dc879dac 100644
--- a/fs/hfsplus/bfind.c
+++ b/fs/hfsplus/bfind.c
@@ -18,7 +18,7 @@ int hfs_find_init(struct hfs_btree *tree, struct hfs_find_data *fd)
 
 	fd->tree = tree;
 	fd->bnode = NULL;
-	ptr = kmalloc(tree->max_key_len * 2 + 4, GFP_KERNEL);
+	ptr = kzalloc(tree->max_key_len * 2 + 4, GFP_KERNEL);
 	if (!ptr)
 		return -ENOMEM;
 	fd->search_key = ptr;
-- 
2.43.0