* Coverity: find_idlest_group(): Null pointer dereferences
@ 2019-10-28 23:03 coverity-bot
2019-10-29 8:07 ` Vincent Guittot
0 siblings, 1 reply; 2+ messages in thread
From: coverity-bot @ 2019-10-28 23:03 UTC (permalink / raw)
To: Vincent Guittot; +Cc: Ingo Molnar, Gustavo A. R. Silva, linux-next
Hello!
This is an experimental automated report about issues detected by Coverity
from a scan of next-20191025 as part of the linux-next weekly scan project:
https://scan.coverity.com/projects/linux-next-weekly-scan
You're getting this email because you were associated with the identified
lines of code (noted below) that were touched by recent commits:
57abff067a08 ("sched/fair: Rework find_idlest_group()")
Coverity reported the following:
*** CID 1487371: Null pointer dereferences (FORWARD_NULL)
/kernel/sched/fair.c: 8319 in find_idlest_group()
8313 case group_asym_packing:
8314 /* Those type are not used in the slow wakeup path */
8315 return NULL;
8316
8317 case group_misfit_task:
8318 /* Select group with the highest max capacity */
vvv CID 1487371: Null pointer dereferences (FORWARD_NULL)
vvv Dereferencing null pointer "local".
8319 if (local->sgc->max_capacity >= idlest->sgc->max_capacity)
8320 return NULL;
8321 break;
8322
8323 case group_has_spare:
8324 if (sd->flags & SD_NUMA) {
If this is a false positive, please let us know so we can mark it as
such, or teach the Coverity rules to be smarter. If not, please make
sure fixes get into linux-next. :) For patches fixing this, please
include:
Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
Addresses-Coverity-ID: 1487371 ("Null pointer dereferences")
Fixes: 57abff067a08 ("sched/fair: Rework find_idlest_group()")
Thanks for your attention!
--
Coverity-bot
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Coverity: find_idlest_group(): Null pointer dereferences
2019-10-28 23:03 Coverity: find_idlest_group(): Null pointer dereferences coverity-bot
@ 2019-10-29 8:07 ` Vincent Guittot
0 siblings, 0 replies; 2+ messages in thread
From: Vincent Guittot @ 2019-10-29 8:07 UTC (permalink / raw)
To: coverity-bot; +Cc: Ingo Molnar, Gustavo A. R. Silva, linux-next
On Tue, 29 Oct 2019 at 00:03, coverity-bot <keescook@chromium.org> wrote:
>
> Hello!
>
> This is an experimental automated report about issues detected by Coverity
> from a scan of next-20191025 as part of the linux-next weekly scan project:
> https://scan.coverity.com/projects/linux-next-weekly-scan
>
> You're getting this email because you were associated with the identified
> lines of code (noted below) that were touched by recent commits:
>
> 57abff067a08 ("sched/fair: Rework find_idlest_group()")
>
> Coverity reported the following:
>
> *** CID 1487371: Null pointer dereferences (FORWARD_NULL)
> /kernel/sched/fair.c: 8319 in find_idlest_group()
> 8313 case group_asym_packing:
> 8314 /* Those type are not used in the slow wakeup path */
> 8315 return NULL;
> 8316
> 8317 case group_misfit_task:
> 8318 /* Select group with the highest max capacity */
> vvv CID 1487371: Null pointer dereferences (FORWARD_NULL)
> vvv Dereferencing null pointer "local".
> 8319 if (local->sgc->max_capacity >= idlest->sgc->max_capacity)
Local can't be NULL and will be set in the loop above because this_cpu
belongs to one of the groups of its sched_domain
> 8320 return NULL;
> 8321 break;
> 8322
> 8323 case group_has_spare:
> 8324 if (sd->flags & SD_NUMA) {
>
> If this is a false positive, please let us know so we can mark it as
> such, or teach the Coverity rules to be smarter. If not, please make
> sure fixes get into linux-next. :) For patches fixing this, please
> include:
>
> Reported-by: coverity-bot <keescook+coverity-bot@chromium.org>
> Addresses-Coverity-ID: 1487371 ("Null pointer dereferences")
> Fixes: 57abff067a08 ("sched/fair: Rework find_idlest_group()")
>
>
> Thanks for your attention!
>
> --
> Coverity-bot
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