Thread (17 messages) 17 messages, 3 authors, 2024-10-04

Re: powerpc/pseries: Fix exception handling in pSeries_reconfig_add_node()

From: Markus Elfring <hidden>
Date: 2023-03-17 14:27:00
Also in: cocci

quoted
The label “out_err” was used to jump to another pointer check despite of
the detail in the implementation of the function “pSeries_reconfig_add_node”
that it was determined already that the corresponding variable contained
a null pointer (because of a failed function call in two cases).

1. Thus return directly after a call of the function “kzalloc” failed.

2. Use more appropriate labels instead.

3. Delete a redundant check.

4. Omit an explicit initialisation for the local variable “err”.

This issue was detected by using the Coccinelle software.
Is there a correctness or safety issue here?
I got the impression that the application of only a single label like “out_err”
resulted in improvable implementation details.

The subject uses the word "fix" but the commit message doesn't seem to identify one.
Can you find the proposed adjustments reasonable?

Can you share how Coccinelle is being invoked and its output?
Please take another look at available information sources.
https://lore.kernel.org/cocci/f9303bdc-b1a7-be5e-56c6-dfa8232b8b55@web.de/ (local)
https://sympa.inria.fr/sympa/arc/cocci/2023-03/msg00017.html

Another command example:
Markus_Elfring@Sonne:…/Projekte/Linux/next-patched> spatch --timeout 23 -j4 --chunksize 1 -dir . …/Projekte/Coccinelle/janitor/show_jumps_to_pointer_check.cocci > ../show_jumps_to_pointer_check-next-20230315.diff 2> ../show_jumps_to_pointer_check-errors-next-20230315.txt


Regards,
Markus
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