Re: [PATCH] scripts/mod/modpost.c: Fix bug in number_prefix

From: Rusty Russell
Date: Tue Jul 08 2014 - 20:36:37 EST

Rasmus Villemoes <linux@xxxxxxxxxxxxxxxxxx> writes:
> Paul Gortmaker <paul.gortmaker@xxxxxxxxxxxxx> writes:
>> On 14-06-25 04:46 AM, Rasmus Villemoes wrote:
>>> The function number_prefix() can currently only return 1 if its
>>> argument is the empty string: If line 3 is reached and *sym (now the
>>> second character in the argument) is not '.', 0 is returned. However,
>>> if that character is '.', the first assignment to c is that same '.',
>>> which obviously fails to be a digit.
>> I'd suggest you expand the commit log to actually list the end-user
>> visible symptom and the use case that this actually fixes, since it
>> isn't obvious to me at all.
> Sorry, it isn't obvious to me either. I just stumbled on it reading the
> code; the rest of modpost.c is too deep magic for me.

The function is horribly mis-named which doesn't help ("number_postfix"
would be closer).

And yes, it's completely broken.

Sam, this never worked, and was clearly never tested. Seems like we
should just rip out the '$' postfix then, or are you aware of platforms
which have been ignoring modpost complaints since 2008?

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