linux-kernel - Re: [syzbot] [crypto?] KASAN: wild-memory-access Read in __sha512

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Message-ID: <tencent_A10DB8A5C88DC712765D8D5D85191DCFBD07@qq.com>
Date: Mon,  8 Sep 2025 20:02:59 +0800
From: Edward Adam Davis <eadavis@...com>
To: syzbot+e37eedd918576774ec80@...kaller.appspotmail.com
Cc: linux-kernel@...r.kernel.org,
	syzkaller-bugs@...glegroups.com
Subject: Re: [syzbot] [crypto?] KASAN: wild-memory-access Read in __sha512_update

#syz test

diff --git a/mm/gup.c b/mm/gup.c
index 010fe56f6e13..22420f2069ee 100644
--- a/mm/gup.c
+++ b/mm/gup.c
@@ -2981,6 +2981,7 @@ static int gup_fast_pmd_leaf(pmd_t orig, pmd_t *pmdp, unsigned long addr,
 		return 0;
 	}
 
+	pages += *nr;
 	*nr += refs;
 	for (; refs; refs--)
 		*(pages++) = page++;
@@ -3024,6 +3025,7 @@ static int gup_fast_pud_leaf(pud_t orig, pud_t *pudp, unsigned long addr,
 		return 0;
 	}
 
+	pages += *nr;
 	*nr += refs;
 	for (; refs; refs--)
 		*(pages++) = page++;