From: Nick Dyer Date: Sun, 8 Jun 2014 06:17:26 +0000 (-0700) Subject: Input: atmel_mxt_ts - fix invalid return from mxt_get_bootloader_version X-Git-Tag: v3.16-rc1~67^2^2 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=68807a0c2015cb40df4869e16651f0ce5cc14d52;p=linux.git Input: atmel_mxt_ts - fix invalid return from mxt_get_bootloader_version The patch e57a66aa8534: "Input: atmel_mxt_ts - read and report bootloader version" from May 18, 2014, leads to the following static checker warning: drivers/input/touchscreen/atmel_mxt_ts.c:437 mxt_get_bootloader_version() warn: signedness bug returning '(-5)' drivers/input/touchscreen/atmel_mxt_ts.c 429 static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val) 430 { 431 struct device *dev = &data->client->dev; 432 u8 buf[3]; 433 434 if (val & MXT_BOOT_EXTENDED_ID) { 435 if (mxt_bootloader_read(data, &buf[0], 3) != 0) { 436 dev_err(dev, "%s: i2c failure\n", __func__); 437 return -EIO; ^^^^ This gets truncated into a number from 0-255 and anyway the caller doesn't check for errors. (reported by Dan Carpenter) Signed-off-by: Nick Dyer Signed-off-by: Dmitry Torokhov --- diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 97495c7edae8..6e0b4a2120d3 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -434,7 +434,7 @@ static u8 mxt_get_bootloader_version(struct mxt_data *data, u8 val) if (val & MXT_BOOT_EXTENDED_ID) { if (mxt_bootloader_read(data, &buf[0], 3) != 0) { dev_err(dev, "%s: i2c failure\n", __func__); - return -EIO; + return val; } dev_dbg(dev, "Bootloader ID:%d Version:%d\n", buf[1], buf[2]);