| Message ID | 20151219105919.GB3749@mwanda (mailing list archive) |
|---|---|
| State | Accepted |
| Delegated to: | Kalle Valo |
| Headers | show |
On Sat, Dec 19, 2015 at 11:59 AM, Dan Carpenter <dan.carpenter@oracle.com> wrote: > There is a type bug so it always returns success. > > Fixes: 6fa658fd5ab2 ('ath9k: Simplify and fix eeprom endianness swapping') > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Acked-by: Martin Blumenstingl <martin.blumenstingl@googlemail.com> Thank you for finding and fixing this one! -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Sat, 2015-12-19 at 13:59 +0300, Dan Carpenter wrote: > There is a type bug so it always returns success. How many false positives do you have to sift through to find this sort of error? > +++ b/drivers/net/wireless/ath/ath9k/eeprom.c > @@ -206,7 +206,7 @@ bool ath9k_hw_nvram_check_version(struct ath_hw *ah, int version, int minrev) > ath_err(common, "Bad EEPROM VER 0x%04x or REV 0x%04x\n", > ah->eep_ops->get_eeprom_ver(ah), > ah->eep_ops->get_eeprom_rev(ah)); > - return -EINVAL; > + return false; > } > > return true; -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Sun, 20 Dec 2015, Joe Perches wrote: > On Sat, 2015-12-19 at 13:59 +0300, Dan Carpenter wrote: > > There is a type bug so it always returns success. > > How many false positives do you have to sift > through to find this sort of error? The return type is thoughtfully bool, so it should be easy in this case. The function has a return -EINVAL and a return true, so even without the return type it would be locally apparent that there is an inconsistency. julia > > > +++ b/drivers/net/wireless/ath/ath9k/eeprom.c > > @@ -206,7 +206,7 @@ bool ath9k_hw_nvram_check_version(struct ath_hw *ah, int version, int minrev) > > ath_err(common, "Bad EEPROM VER 0x%04x or REV 0x%04x\n", > > ah->eep_ops->get_eeprom_ver(ah), > > ah->eep_ops->get_eeprom_rev(ah)); > > - return -EINVAL; > > + return false; > > } > > > > return true; > > -- > To unsubscribe from this list: send the line "unsubscribe kernel-janitors" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html >
On Sun, 2015-12-20 at 20:00 +0100, Julia Lawall wrote: > On Sun, 20 Dec 2015, Joe Perches wrote: > > > On Sat, 2015-12-19 at 13:59 +0300, Dan Carpenter wrote: > > > There is a type bug so it always returns success. > > > > How many false positives do you have to sift > > through to find this sort of error? > > The return type is thoughtfully bool, so it should be easy in this case. > The function has a return -EINVAL and a return true, so even without the > return type it would be locally apparent that there is an inconsistency. True, -EINVAL is a non-bool constant, but bool returns can be a variable int. Dan, was the check any constant non-bool? -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
On Sun, Dec 20, 2015 at 11:05:55AM -0800, Joe Perches wrote: > On Sun, 2015-12-20 at 20:00 +0100, Julia Lawall wrote: > > On Sun, 20 Dec 2015, Joe Perches wrote: > > > > > On Sat, 2015-12-19 at 13:59 +0300, Dan Carpenter wrote: > > > > There is a type bug so it always returns success. > > > > > > How many false positives do you have to sift > > > through to find this sort of error? > > > > The return type is thoughtfully bool, so it should be easy in this case. > > The function has a return -EINVAL and a return true, so even without the > > return type it would be locally apparent that there is an inconsistency. > > True, -EINVAL is a non-bool constant, but > bool returns can be a variable int. > > Dan, was the check any constant non-bool? This warning is for returning negative with unsigned types smaller than int. It's doing cross function flow analysis so it could warning about other things besides constants, but it's 90% constants. It warns about ds2482_w1_triplet() for example. There aren't many false positives. regards, dan carpenter -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
Dan Carpenter <dan.carpenter@oracle.com> writes: > There is a type bug so it always returns success. > > Fixes: 6fa658fd5ab2 ('ath9k: Simplify and fix eeprom endianness swapping') > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> Applied to ath.git, thanks.
diff --git a/drivers/net/wireless/ath/ath9k/eeprom.c b/drivers/net/wireless/ath/ath9k/eeprom.c index f8c5065..a7afdee 100644 --- a/drivers/net/wireless/ath/ath9k/eeprom.c +++ b/drivers/net/wireless/ath/ath9k/eeprom.c @@ -206,7 +206,7 @@ bool ath9k_hw_nvram_check_version(struct ath_hw *ah, int version, int minrev) ath_err(common, "Bad EEPROM VER 0x%04x or REV 0x%04x\n", ah->eep_ops->get_eeprom_ver(ah), ah->eep_ops->get_eeprom_rev(ah)); - return -EINVAL; + return false; } return true;
There is a type bug so it always returns success. Fixes: 6fa658fd5ab2 ('ath9k: Simplify and fix eeprom endianness swapping') Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html