linux-kernel - Forwarded: Re: [syzbot] [kernel?] KASAN: slab-out-of-bounds Read in change_page_attr_set

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Message-ID: <68c4fd67.050a0220.3c6139.04c0.GAE@google.com>
Date: Fri, 12 Sep 2025 22:13:11 -0700
From: syzbot <syzbot+e34177f6091df113ef20@...kaller.appspotmail.com>
To: linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: Forwarded: Re: [syzbot] [kernel?] KASAN: slab-out-of-bounds Read in change_page_attr_set_clr

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***

Subject: Re: [syzbot] [kernel?] KASAN: slab-out-of-bounds Read in change_page_attr_set_clr
Author: chandna.linuxkernel@...il.com

#syz test

--- a/arch/x86/mm/pat/set_memory.c
+++ b/arch/x86/mm/pat/set_memory.c
@@ -305,6 +305,9 @@ static inline unsigned long fix_addr(unsigned long addr)

  static unsigned long __cpa_addr(struct cpa_data *cpa, unsigned long idx)
  {
+       if (WARN_ON_ONCE(!cpa->pages || !cpa->pages[idx]))
+               return 0;
+
         if (cpa->flags & CPA_PAGES_ARRAY) {
                 struct page *page = cpa->pages[idx];

-- 
2.51.0