Hi Nathan,
Thanks for the report! :)
On 2019/8/1 1:57, Nathan Chancellor wrote:
> Hi all,
>
> <snip>
>
>> 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
> .
>
