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Tue, 18 Aug 2026 01:35:14 -0700 (PDT) From: Yu Junzhe To: Mikulas Patocka , Mike Snitzer , Benjamin Marzinski , Alasdair Kergon Cc: dm-devel@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [BUG] dm-integrity: mode R resume NULL deref when DIRTY_BITMAP is set Date: Tue, 18 Aug 2026 08:35:10 +0000 Message-ID: <20260818083511.352-1-junzheyu1@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260817100605.292-1-junzheyu1@gmail.com> References: <20260817100605.292-1-junzheyu1@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Hi Mikulas, Thanks for the patch. We A/B-tested it on Linux 6.6.144 KASAN against the minimized PoC (mode B format, plant SB_FLAG_DIRTY_BITMAP, load+resume mode R). Results: - unpatched: KASAN null-ptr-deref in list_get_page via rw_journal_sectors / dm_integrity_resume - with your change (skip writes in dm_integrity_resume when mode == 'R'): PoC completes; no list_get_page / KASAN on resume Happy to test follow-ups if needed. Thanks, Yu Junzhe FuzzAnything