Re: [PATCH] io_uring: fix a use after free in io_async_task_func()

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On Wed, Jul 08, 2020 at 10:28:51PM +0300, Pavel Begunkov wrote:
> On 08/07/2020 22:15, Jens Axboe wrote:
> > On 7/8/20 12:47 PM, Dan Carpenter wrote:
> >> The "apoll" variable is freed and then used on the next line.  We need
> >> to move the free down a few lines.
> > 
> > Thanks for spotting this Dan, applied.
> 
> I wonder why gcc can't find it... It shouldn't be hard to do after
> marking free-like functions with an attribute.
> 
> Are there such tools for the kernel?

GCC doesn't have an __attribute__((free)) yet.  Martin Sebor is working on
it: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87736
also: https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94527

(I just confirmed with him on IRC that he's still working on it; it's
part of an ongoing larger project)



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