Re: [f2fs-dev] [PATCH] f2fs: fix null reference error when checking end of zone

[Daeho Jeong <daeho43@gmail.com>]

On Thu, Jul 4, 2024 at 12:17 AM Chao Yu <chao@kernel.org> wrote:
>
> On 2024/7/4 9:01, Daejun Park wrote:
> > This patch fixes a potentially null pointer being accessed by
> > is_end_zone_blkaddr() that checks the last block of a zone
> > when f2fs is mounted as a single device.
>
> blkzoned feature depends on multiple device feature? One regular
> device and one seq-zone device?
>
> Thanks,
>
> >
> > Fixes: e067dc3c6b9c ("f2fs: maintain six open zones for zoned devices")
> > Signed-off-by: Daejun Park <daejun7.park@samsung.com>
> > ---
> >   fs/f2fs/data.c | 4 +++-
> >   1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
> > index b6dcb3bcaef7..1aa7eefa659c 100644
> > --- a/fs/f2fs/data.c
> > +++ b/fs/f2fs/data.c
> > @@ -925,6 +925,7 @@ int f2fs_merge_page_bio(struct f2fs_io_info *fio)
> >   #ifdef CONFIG_BLK_DEV_ZONED
> >   static bool is_end_zone_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr)
> >   {
> > +     struct block_device *bdev = sbi->sb->s_bdev;
> >       int devi = 0;
> >
> >       if (f2fs_is_multi_device(sbi)) {
> > @@ -935,8 +936,9 @@ static bool is_end_zone_blkaddr(struct f2fs_sb_info *sbi, block_t blkaddr)
> >                       return false;
> >               }
> >               blkaddr -= FDEV(devi).start_blk;
> > +             bdev = FDEV(devi).bdev;
> >       }
> > -     return bdev_is_zoned(FDEV(devi).bdev) &&
> > +     return bdev_is_zoned(bdev) &&
> >               f2fs_blkz_is_seq(sbi, devi, blkaddr) &&
> >               (blkaddr % sbi->blocks_per_blkz == sbi->blocks_per_blkz - 1);
> >   }
>

Reviewed-by: Daeho Jeong <daehojeong@google.com>

Thanks,


>
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