| Message ID | 20211112124411.1948809-5-roberto.sassu@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | shmem/fsverity: Prepare for mandatory integrity enforcement | expand |
On Fri, Nov 12, 2021 at 01:44:10PM +0100, Roberto Sassu wrote: > Check the hwpoison page flag only if the page is valid in > shmem_read_mapping_page_gfp(). The PageHWPoison() macro tries to access > the page flags and cannot work on an error pointer. > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> This looks like a recent regression from the commit: commit b9d02f1bdd98f38e6e5ecacc9786a8f58f3f8b2c Author: Yang Shi <shy828301@gmail.com> Date: Fri Nov 5 13:41:10 2021 -0700 mm: shmem: don't truncate page if memory failure happens Can you please send this fix out as a standalone patch, to the right people and including the appropriate "Fixes" tag? - Eric
> From: Eric Biggers [mailto:ebiggers@kernel.org] > Sent: Friday, November 12, 2021 7:56 PM > On Fri, Nov 12, 2021 at 01:44:10PM +0100, Roberto Sassu wrote: > > Check the hwpoison page flag only if the page is valid in > > shmem_read_mapping_page_gfp(). The PageHWPoison() macro tries to > access > > the page flags and cannot work on an error pointer. > > > > Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> > > This looks like a recent regression from the commit: > > commit b9d02f1bdd98f38e6e5ecacc9786a8f58f3f8b2c > Author: Yang Shi <shy828301@gmail.com> > Date: Fri Nov 5 13:41:10 2021 -0700 > > mm: shmem: don't truncate page if memory failure happens > > Can you please send this fix out as a standalone patch, to the right people and > including the appropriate "Fixes" tag? Hi Eric it looks there is another patch. Given that it was proposed before, I will drop mine. Thanks anyway. Roberto HUAWEI TECHNOLOGIES Duesseldorf GmbH, HRB 56063 Managing Director: Li Peng, Zhong Ronghua
diff --git a/mm/shmem.c b/mm/shmem.c index 23c91a8beb78..427863cbf0dc 100644 --- a/mm/shmem.c +++ b/mm/shmem.c @@ -4222,7 +4222,7 @@ struct page *shmem_read_mapping_page_gfp(struct address_space *mapping, else unlock_page(page); - if (PageHWPoison(page)) + if (!IS_ERR(page) && PageHWPoison(page)) page = ERR_PTR(-EIO); return page;
Check the hwpoison page flag only if the page is valid in shmem_read_mapping_page_gfp(). The PageHWPoison() macro tries to access the page flags and cannot work on an error pointer. Signed-off-by: Roberto Sassu <roberto.sassu@huawei.com> --- mm/shmem.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)