Hi Nathan,

Thanks for the report! :)

On 2019/8/1 1:57, Nathan Chancellor wrote:

Hi all,

<snip>

quoted

diff --git a/fs/f2fs/hash.c b/fs/f2fs/hash.c
index cc82f142f811f..99e79934f5088 100644
--- a/fs/f2fs/hash.c
+++ b/fs/f2fs/hash.c

@@ -14,6 +14,7 @@
 #include <linux/f2fs_fs.h>
 #include <linux/cryptohash.h>
 #include <linux/pagemap.h>
+#include <linux/unicode.h>
 
 #include "f2fs.h"
 

@@ -67,7 +68,7 @@ static void str2hashbuf(const unsigned char *msg, size_t len,
 		*buf++ = pad;
 }
 
-f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info,
+static f2fs_hash_t __f2fs_dentry_hash(const struct qstr *name_info,
 				struct fscrypt_name *fname)
 {
 	__u32 hash;

@@ -103,3 +104,35 @@ f2fs_hash_t f2fs_dentry_hash(const struct qstr *name_info,
 	f2fs_hash = cpu_to_le32(hash & ~F2FS_HASH_COL_BIT);
 	return f2fs_hash;
 }
+
+f2fs_hash_t f2fs_dentry_hash(const struct inode *dir,
+		const struct qstr *name_info, struct fscrypt_name *fname)
+{
+#ifdef CONFIG_UNICODE
+	struct f2fs_sb_info *sbi = F2FS_SB(dir->i_sb);
+	const struct unicode_map *um = sbi->s_encoding;
+	int r, dlen;
+	unsigned char *buff;
+	struct qstr *folded;
+
+	if (name_info->len && IS_CASEFOLDED(dir)) {
+		buff = f2fs_kzalloc(sbi, sizeof(char) * PATH_MAX, GFP_KERNEL);
+		if (!buff)
+			return -ENOMEM;
+
+		dlen = utf8_casefold(um, name_info, buff, PATH_MAX);
+		if (dlen < 0) {
+			kvfree(buff);
+			goto opaque_seq;
+		}
+		folded->name = buff;
+		folded->len = dlen;
+		r = __f2fs_dentry_hash(folded, fname);
+
+		kvfree(buff);
+		return r;
+	}
+opaque_seq:
+#endif
+	return __f2fs_dentry_hash(name_info, fname);
+}

Clang now warns:

fs/f2fs/hash.c:128:3: warning: variable 'folded' is uninitialized when used here [-Wuninitialized]
                folded->name = buff;
                ^~~~~~
fs/f2fs/hash.c:116:21: note: initialize the variable 'folded' to silence this warning
        struct qstr *folded;
                           ^
                            = NULL
1 warning generated.

I assume that it wants to be initialized with f2fs_kzalloc as well but
I am not familiar with this code and what it expects to do.

Please look into this when you get a chance!

That should be a bug, it needs to define a struct qstr type variable rather than
a pointer there.

Jaegeuk, could you fix this in you branch?

Thanks,

Nathan
.