mm/gup: fix memfd_pin_folios alloc race panic

commit ce645b9fdc78ec5d28067286e92871ddae6817d5 upstream.

If memfd_pin_folios tries to create a hugetlb page, but someone else
already did, then folio gets the value -EEXIST here:

        folio = memfd_alloc_folio(memfd, start_idx);
        if (IS_ERR(folio)) {
                ret = PTR_ERR(folio);
                if (ret != -EEXIST)
                        goto err;

then on the next trip through the "while start_idx" loop we panic here:

        if (folio) {
                folio_put(folio);

To fix, set the folio to NULL on error.

Link: https://lkml.kernel.org/r/1725373521-451395-6-git-send-email-steven.sistare@oracle.com
Fixes: 89c1905d9c14 ("mm/gup: introduce memfd_pin_folios() for pinning memfd folios")
Signed-off-by: Steve Sistare <steven.sistare@oracle.com>
Acked-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Jason Gunthorpe <jgg@nvidia.com>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Muchun Song <muchun.song@linux.dev>
Cc: Peter Xu <peterx@redhat.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/mm/gup.c b/mm/gup.c
index 5b92f1d75ae9833fb5b8691987b5baad7b24b502..bccabaa78804ac2e76d52b785b1596214f0aa214 100644 (file)
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -3705,6 +3705,7 @@ long memfd_pin_folios(struct file *memfd, loff_t start, loff_t end,
                                        ret = PTR_ERR(folio);
                                        if (ret != -EEXIST)
                                                goto err;
+                                       folio = NULL;
                                }
                        }
                }