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On 8/24/26 5:59 PM, David Hildenbrand (Arm) wrote: > On 8/24/26 14:27, Mark Brown wrote: >> On Mon, Aug 24, 2026 at 02:17:03PM +0200, David Hildenbrand (Arm) wrote: >>> On 8/13/26 20:12, Sarthak Sharma wrote: >> >>>> + if (buf[0] < '0' || buf[0] > '9') >>>> + return -EINVAL; >> >>> This is to reject any negative or hexadecimal numbers I assume? >> >> That won't reject hexidecimal - 0xNNNN matches the above. > > Ugh, yes (and stuff starting without 0x would not be detected consistently). > Yup, this is to reject anything that is not a digit. This check does not reject hexadecimal values, but the strtoul(..., 10) stops at the x in 0xNNNN. Then the check if (*end != '\0') return -EINVAL; makes read_num() return -EINVAL.