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([111.42.148.111]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-6f4d2a6641dsm23591883b3a.4.2024.05.23.02.26.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 23 May 2024 02:26:41 -0700 (PDT) From: Shichao Lai To: stern@rowland.harvard.edu, gregkh@linuxfoundation.org, oneukum@suse.com Cc: linux-usb@vger.kernel.org, usb-storage@lists.one-eyed-alien.net, linux-kernel@vger.kernel.org, Shichao Lai , xingwei lee , yue sun Subject: [PATCHv2] Check whether divisor is non-zero before division Date: Thu, 23 May 2024 17:26:08 +0800 Message-Id: <20240523092608.874986-1-shichaorai@gmail.com> X-Mailer: git-send-email 2.34.1 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Since uzonesize may be zero, so judgements for non-zero are nessesary in both place. Previous check is moved out of loop, and one more check is added in alauda_write_lba. Reported-by: xingwei lee Reported-by: yue sun Signed-off-by: Shichao Lai --- drivers/usb/storage/alauda.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/storage/alauda.c b/drivers/usb/storage/alauda.c index 115f05a6201a..a6e60ef5cb0d 100644 --- a/drivers/usb/storage/alauda.c +++ b/drivers/usb/storage/alauda.c @@ -818,6 +818,8 @@ static int alauda_write_lba(struct us_data *us, u16 lba, unsigned int blocksize = MEDIA_INFO(us).blocksize; unsigned int lba_offset = lba % uzonesize; unsigned int new_pba_offset; + if (!uzonesize) + return USB_STOR_TRANSPORT_ERROR; unsigned int zone = lba / uzonesize; alauda_ensure_map_for_zone(us, zone); @@ -923,6 +925,8 @@ static int alauda_read_data(struct us_data *us, unsigned long address, unsigned int uzonesize = MEDIA_INFO(us).uzonesize; struct scatterlist *sg; int result; + if (!uzonesize) + return USB_STOR_TRANSPORT_ERROR; /* * Since we only read in one block at a time, we have to create