linux-kernel - Re: [syzbot] [mm?] general protection fault in mremap

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Message-ID: <tencent_58BA62BBDD331C9E981BDB4B611B6725A508@qq.com>
Date: Sun,  6 Apr 2025 10:02:27 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+5250c4727db03e3436cc@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [mm?] general protection fault in mremap

#syz test

diff --git a/mm/mremap.c b/mm/mremap.c
index 0865387531ed..7db9da609c84 100644
--- a/mm/mremap.c
+++ b/mm/mremap.c
@@ -1561,11 +1561,12 @@ static unsigned long expand_vma_in_place(struct vma_remap_struct *vrm)
 	 * adjacent to the expanded vma and otherwise
 	 * compatible.
 	 */
-	vma = vrm->vma = vma_merge_extend(&vmi, vma, vrm->delta);
+	vma = vma_merge_extend(&vmi, vma, vrm->delta);
 	if (!vma) {
 		vrm_uncharge(vrm);
 		return -ENOMEM;
 	}
+	vrm->vma = vma;
 
 	vrm_stat_account(vrm, vrm->delta);