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[34.82.187.25]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-cc7da126a49sm453319a12.7.2026.09.30.01.19.53 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Sep 2026 01:19:53 -0700 (PDT) From: Hui Peng To: Anders Larsen , Matthias Goergens Cc: linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Hui Peng Subject: [PATCH v5 6/6] qnx6: validate sb_blocksize before dividing in qnx6_mmi_fill_super() Date: Wed, 30 Sep 2026 08:19:47 +0000 Message-ID: <20260930081947.511613-7-benquike@gmail.com> X-Mailer: git-send-email 2.56.0.rc1.315.gc6ed9934b7-goog In-Reply-To: <20260930081947.511613-1-benquike@gmail.com> References: <20260930081947.511613-1-benquike@gmail.com> Precedence: bulk X-Mailing-List: linux-fsdevel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit In qnx6_mmi_fill_super(), sb1->sb_blocksize is loaded directly from disk without checking for zero before calculating: QNX6_BOOTBLOCK_SIZE / fs32_to_cpu(sbi, sb1->sb_blocksize) If sb_blocksize is zero on a corrupted MMI filesystem image, this division causes a divide-by-zero error in kernel space. Validate sb1->sb_blocksize before dividing in qnx6_mmi_fill_super(). Fixes: 3377755f1064 ("qnx6: add support for MMI (MME) media filesystem variant") Cc: stable@vger.kernel.org Tested-by: Matthias Goergens Assisted-by: LLM Signed-off-by: Hui Peng --- fs/qnx6/super_mmi.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/qnx6/super_mmi.c b/fs/qnx6/super_mmi.c index 2b6183d2c889..fe84a9e2012d 100644 --- a/fs/qnx6/super_mmi.c +++ b/fs/qnx6/super_mmi.c @@ -48,6 +48,8 @@ struct qnx6_super_block *qnx6_mmi_fill_super(struct super_block *s, int silent) sb1 = (struct qnx6_super_block *)bh1->b_data; /* calculate second superblock blocknumber */ + if (!fs32_to_cpu(sbi, sb1->sb_blocksize)) + goto out1; offset = fs32_to_cpu(sbi, sb1->sb_num_blocks) + (QNX6_BOOTBLOCK_SIZE / fs32_to_cpu(sbi, sb1->sb_blocksize)); -- 2.47.3