Re: [Cocci] [PATCH V3] scripts/coccinelle/free: Delete NULL test before freeing functions?

[Julia Lawall]

On Sat, 28 Jun 2014, SF Markus Elfring wrote:

> > Sorry but I'm not working on coccinelle ; just did a small script for kernel tree.
> 
> I would appreciate a more constructive feedback for my update suggestions around
> the topic "Deletion of unnecessary checks before specific function calls".
> - Did you look at the concrete patches?
> - How do you think about the general approach?
> 
> Examples:
> https://systeme.lip6.fr/pipermail/cocci/2014-March/000676.html
> http://marc.info/?l=kernel-janitors&m=139405971927100&w=2

Regular expressions do not allow taking advantage of the optimizations 
provided by Coccinelle and are not easy for a reader to understand.

> https://systeme.lip6.fr/pipermail/cocci/2014-March/000677.html
> http://marc.info/?l=kernel-janitors&m=139405983727148&w=2

This is not safe due to the use of when any.  You have no guarantee that 
there is not a dereference of input in the matched region, or that the 
value of input is still the argument value at the point of the test.

julia
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/