[musl] pthread_getspecific(3) with negative key

[musl] pthread_getspecific(3) with negative key

[Alexander Scherbatiy]

Hello,

The pthread_getspecific(3) specification describes:
   "The pthread_getspecific() function shall return the thread-specific 
data value associated with the given key. If no thread-specific data 
value is associated with key, then the value NULL shall be returned. "

The glibc version pthread_getspecific(3) returns NULL for the negative 
key value.
The musl version does not check key bounds [1].
Is it intentional behavior?

[1] 
https://git.musl-libc.org/cgit/musl/tree/src/thread/pthread_getspecific.c#n7

Thanks,
Alexander.

Re: [musl] pthread_getspecific(3) with negative key

[Florian Weimer]

* Alexander Scherbatiy:

> The pthread_getspecific(3) specification describes:
>   "The pthread_getspecific() function shall return the thread-specific
> data value associated with the given key. If no thread-specific data
> value is associated with key, then the value NULL shall be returned. "

POSIX says this:

| The effect of calling pthread_getspecific() or pthread_setspecific()
| with a key value not obtained from pthread_key_create() or after key
| has been deleted with pthread_key_delete() is undefined.

So no check for a valid key is required.

Thanks,
Florian