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| author | Nick Dyer <nick.dyer@itdev.co.uk> | 2014-06-07 23:17:26 -0700 |
|---|---|---|
| committer | Dmitry Torokhov <dmitry.torokhov@gmail.com> | 2014-06-07 23:20:24 -0700 |
| commit | 68807a0c2015cb40df4869e16651f0ce5cc14d52 (patch) | |
| tree | 527f4530edf3695e3f1eff4029c546d9cb560695 /drivers/input | |
| parent | b1bc3031e87f98f5f56f4f8fc23609371dbfa3bf (diff) | |
| download | linux-68807a0c2015cb40df4869e16651f0ce5cc14d52.tar.bz2 | |
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 <nick.dyer@itdev.co.uk>
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Diffstat (limited to 'drivers/input')
| -rw-r--r-- | drivers/input/touchscreen/atmel_mxt_ts.c | 2 |
1 files changed, 1 insertions, 1 deletions
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]); |