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Howlett" , Linus Torvalds Cc: Vegard Nossum , Andrew Morton , "linux-mm@kvack.org" , linux-kernel Date: Wed, 28 Jun 2023 11:42:45 +0100 Content-Type: multipart/signed; micalg="sha-256"; protocol="application/pkcs7-signature"; boundary="=-OhQdJGFvrQGmTY1noH15" User-Agent: Evolution 3.44.4-0ubuntu1 MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by casper.infradead.org. See http://www.infradead.org/rpr.html X-Rspamd-Queue-Id: A27448000E X-Rspam-User: X-Rspamd-Server: rspam04 X-Stat-Signature: oom4wnmsbpzs5sp466ua1cfswe5ms3dt X-HE-Tag: 1687948972-707393 X-HE-Meta: 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 TmYMrWKE 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --=-OhQdJGFvrQGmTY1noH15 Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable From: David Woodhouse If mas_store_gfp() in the gather loop failed, the 'error' variable that ultimately gets returned was not being set. In many cases, its original value of -ENOMEM was still in place, and that was fine. But if VMAs had been split at the start or end of the range, then 'error' could be zero. Change to the 'error =3D foo(); if (error) goto =E2=80=A6' idiom to fix the= bug. Also clean up a later case which avoided the same bug by *explicitly* setting error =3D -ENOMEM right before calling the function that might return -ENOMEM. In a final cosmetic change, move the 'Point of no return' comment to *after* the goto. That's been in the wrong place since the preallocation was removed, and this new error path was added. Fixes: 606c812eb1d5 ("mm/mmap: Fix error path in do_vmi_align_munmap()") Signed-off-by: David Woodhouse --- mm/mmap.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/mm/mmap.c b/mm/mmap.c index d600404580b2..13128e908470 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2387,7 +2387,8 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struct = vm_area_struct *vma, } vma_start_write(next); mas_set_range(&mas_detach, next->vm_start, next->vm_end - 1); - if (mas_store_gfp(&mas_detach, next, GFP_KERNEL)) + error =3D mas_store_gfp(&mas_detach, next, GFP_KERNEL); + if (error) goto munmap_gather_failed; vma_mark_detached(next, true); if (next->vm_flags & VM_LOCKED) @@ -2436,12 +2437,12 @@ do_vmi_align_munmap(struct vma_iterator *vmi, struc= t vm_area_struct *vma, BUG_ON(count !=3D test_count); } #endif - /* Point of no return */ - error =3D -ENOMEM; vma_iter_set(vmi, start); - if (vma_iter_clear_gfp(vmi, start, end, GFP_KERNEL)) + error =3D vma_iter_clear_gfp(vmi, start, 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