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[35.245.152.114]) by smtp.gmail.com with ESMTPSA id r3-20020a0cf603000000b006a0affc7c6esm3020797qvm.63.2024.04.29.08.20.18 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 29 Apr 2024 08:20:18 -0700 (PDT) From: Ricardo Ribalda Date: Mon, 29 Apr 2024 15:20:18 +0000 Subject: [PATCH] media: dw2102: Fix size check Precedence: bulk X-Mailing-List: linux-media@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20240429-dw2102-v1-1-a5d81dfc1453@chromium.org> X-B4-Tracking: v=1; b=H4sIALG6L2YC/6tWKk4tykwtVrJSqFYqSi3LLM7MzwNyDHUUlJIzE vPSU3UzU4B8JSMDIxMDEyNL3ZRyI0MDI93UFOMUQyOLRENTCyMloOKCotS0zAqwQdGxtbUAmJ8 APVgAAAA= To: Mauro Carvalho Chehab Cc: Hans Verkuil , linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Ricardo Ribalda X-Mailer: b4 0.12.4 The data is going to be copied at state->data[4], not at state->data[1], fix the check to avoid stack overruns. Found with smatch: drivers/media/usb/dvb-usb/dw2102.c:802 su3000_i2c_transfer() error: __builtin_memcpy() '&state->data[4]' too small (64 vs 67) drivers/media/usb/dvb-usb/dw2102.c:802 su3000_i2c_transfer() error: __builtin_memcpy() '&state->data[4]' too small (64 vs 67) Cc: Fixes: 0e148a522b84 ("media: dw2102: Don't translate i2c read into write") Signed-off-by: Ricardo Ribalda --- This time it could be relevant though. --- drivers/media/usb/dvb-usb/dw2102.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/usb/dvb-usb/dw2102.c b/drivers/media/usb/dvb-usb/dw2102.c index 03b411ad64bb..79e2ccf974c9 100644 --- a/drivers/media/usb/dvb-usb/dw2102.c +++ b/drivers/media/usb/dvb-usb/dw2102.c @@ -789,7 +789,7 @@ static int su3000_i2c_transfer(struct i2c_adapter *adap, struct i2c_msg msg[], if (msg[j].flags & I2C_M_RD) { /* single read */ - if (1 + msg[j].len > sizeof(state->data)) { + if (4 + msg[j].len > sizeof(state->data)) { warn("i2c rd: len=%d is too big!\n", msg[j].len); num = -EOPNOTSUPP; break; --- base-commit: cefc10d0d9164eb2f62e789b69dc658dc851eb58 change-id: 20240429-dw2102-ed3d128a1582 Best regards, -- Ricardo Ribalda