| Message ID | d7cfd04d410accee4148d8c0e51230bcb8b4bb8f.1685461490.git.johannes.thumshirn@wdc.com (mailing list archive) |
|---|---|
| State | Handled Elsewhere, archived |
| Headers | show |
| Series | bio: check return values of bio_add_page | expand |
On Tue, May 30, 2023 at 8:50 AM Johannes Thumshirn <johannes.thumshirn@wdc.com> wrote: > > alloc_behind_master_bio() can possibly add multiple pages to a bio, but it > is not checking for the return value of bio_add_page() if adding really > succeeded. > > Check if the page adding succeeded and if not bail out. > > Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Acked-by: Song Liu <song@kernel.org> > --- > drivers/md/raid1.c | 5 ++++- > 1 file changed, 4 insertions(+), 1 deletion(-) > > diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c > index 68a9e2d9985b..8283ef177f6c 100644 > --- a/drivers/md/raid1.c > +++ b/drivers/md/raid1.c > @@ -1147,7 +1147,10 @@ static void alloc_behind_master_bio(struct r1bio *r1_bio, > if (unlikely(!page)) > goto free_pages; > > - bio_add_page(behind_bio, page, len, 0); > + if (!bio_add_page(behind_bio, page, len, 0)) { > + free_page(page); > + goto free_pages; > + } > > size -= len; > i++; > -- > 2.40.1 >
On Tue, May 30, 2023 at 08:49:16AM -0700, Johannes Thumshirn wrote: > alloc_behind_master_bio() can possibly add multiple pages to a bio, but it > is not checking for the return value of bio_add_page() if adding really > succeeded. > > Check if the page adding succeeded and if not bail out. > > Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com> Looks good: Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index 68a9e2d9985b..8283ef177f6c 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1147,7 +1147,10 @@ static void alloc_behind_master_bio(struct r1bio *r1_bio, if (unlikely(!page)) goto free_pages; - bio_add_page(behind_bio, page, len, 0); + if (!bio_add_page(behind_bio, page, len, 0)) { + free_page(page); + goto free_pages; + } size -= len; i++;