f2fs: fix uninit-value in f2fs_lookup

As syzbot reported:

Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x21c/0x280 lib/dump_stack.c:118
 kmsan_report+0xf7/0x1e0 mm/kmsan/kmsan_report.c:122
 __msan_warning+0x58/0xa0 mm/kmsan/kmsan_instr.c:219
 f2fs_lookup+0xe05/0x1a80 fs/f2fs/namei.c:503
 lookup_open fs/namei.c:3082 [inline]
 open_last_lookups fs/namei.c:3177 [inline]
 path_openat+0x2729/0x6a90 fs/namei.c:3365
 do_filp_open+0x2b8/0x710 fs/namei.c:3395
 do_sys_openat2+0xa88/0x1140 fs/open.c:1168
 do_sys_open fs/open.c:1184 [inline]
 __do_compat_sys_openat fs/open.c:1242 [inline]
 __se_compat_sys_openat+0x2a4/0x310 fs/open.c:1240
 __ia32_compat_sys_openat+0x56/0x70 fs/open.c:1240
 do_syscall_32_irqs_on arch/x86/entry/common.c:80 [inline]
 __do_fast_syscall_32+0x129/0x180 arch/x86/entry/common.c:139
 do_fast_syscall_32+0x6a/0xc0 arch/x86/entry/common.c:162
 do_SYSENTER_32+0x73/0x90 arch/x86/entry/common.c:205
 entry_SYSENTER_compat_after_hwframe+0x4d/0x5c

In f2fs_lookup(), @res_page could be used before being initialized,
because in __f2fs_find_entry(), once F2FS_I(dir)->i_current_depth was
been fuzzed to zero, then @res_page will never be initialized, causing
this kmsan warning, relocating @res_page initialization place to fix
this bug.

Reported-by: syzbot+0eac6f0bbd558fd866d7@syzkaller.appspotmail.com
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>

diff --git a/fs/f2fs/dir.c b/fs/f2fs/dir.c
index 74342d9..2646964 100644 (file)
--- a/fs/f2fs/dir.c
+++ b/fs/f2fs/dir.c
@@ -353,16 +353,15 @@ struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
        unsigned int max_depth;
        unsigned int level;
 
+       *res_page = NULL;
+
        if (f2fs_has_inline_dentry(dir)) {
-               *res_page = NULL;
                de = f2fs_find_in_inline_dir(dir, fname, res_page);
                goto out;
        }
 
-       if (npages == 0) {
-               *res_page = NULL;
+       if (npages == 0)
                goto out;
-       }
 
        max_depth = F2FS_I(dir)->i_current_depth;
        if (unlikely(max_depth > MAX_DIR_HASH_DEPTH)) {
@@ -373,7 +372,6 @@ struct f2fs_dir_entry *__f2fs_find_entry(struct inode *dir,
        }
 
        for (level = 0; level < max_depth; level++) {
-               *res_page = NULL;
                de = find_in_level(dir, level, fname, res_page);
                if (de || IS_ERR(*res_page))
                        break;