Re: [bug report] fs/ntfs3: Add attrib operations

[Konstantin Komarov <almaz.alexandrovich@paragon-software.com>]

On 4/10/26 12:15, Dan Carpenter wrote:

> Hello Konstantin Komarov,
>
> Commit be71b5cba2e6 ("fs/ntfs3: Add attrib operations") from Aug 13,
> 2021 (linux-next), leads to the following Smatch static checker
> warning:
>
> 	fs/ntfs3/attrib.c:176 attr_allocate_clusters()
> 	error: we previously assumed 'pre_alloc' could be null (see line 167)
>
> fs/ntfs3/attrib.c
>      160 int attr_allocate_clusters(struct ntfs_sb_info *sbi, struct runs_tree *run,
>      161                            struct runs_tree *run_da, CLST vcn, CLST lcn,
>      162                            CLST len, CLST *pre_alloc, enum ALLOCATE_OPT opt,
>      163                            CLST *alen, const size_t fr, CLST *new_lcn,
>      164                            CLST *new_len)
>      165 {
>      166         int err;
>      167         CLST flen, vcn0 = vcn, pre = pre_alloc ? *pre_alloc : 0;
>      168         size_t cnt = run->count;
>      169
>      170         for (;;) {
>      171                 err = ntfs_look_for_free_space(sbi, lcn, len + pre, &lcn, &flen,
>      172                                                opt);
>      173
>      174                 if (err == -ENOSPC && pre) {
>      175                         pre = 0;
> --> 176                         if (*pre_alloc)
>
> I'm not sure why warnings from 2021 are showing up as new warnings but
> presumably this should be:
>
> 	if (pre_alloc)
> 		*pre_alloc = 0;
>
>      177                                 *pre_alloc = 0;
>      178                         continue;
>      179                 }
>      180
>      181                 if (err == -ENOSPC && new_len && vcn - vcn0) {
>      182                         /* Keep already allocated clusters. */
>      183                         *alen = vcn - vcn0;
>
> This email is a free service from the Smatch-CI project [smatch.sf.net].
>
> regards,
> dan carpenter

Hello,

Thanks. The warning was fixed in the patch:
https://lore.kernel.org/ntfs3/20260415155413.26884-1-almaz.alexandrovich@paragon-software.com/

Regards,
Konstantin