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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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26467b0f84
When a mon group is being deleted, rdtgrp->flags is set to RDT_DELETED
in rdtgroup_rmdir_mon() firstly. The structure of rdtgrp will be freed
until rdtgrp->waitcount is dropped to 0 in rdtgroup_kn_unlock() later.
During the window of deleting a mon group, if an application calls
rdtgroup_mondata_show() to read mondata under this mon group,
'rdtgrp' returned from rdtgroup_kn_lock_live() is a NULL pointer when
rdtgrp->flags is RDT_DELETED. And then 'rdtgrp' is passed in this path:
rdtgroup_mondata_show() --> mon_event_read() --> mon_event_count().
Thus it results in NULL pointer dereference in mon_event_count().
Check 'rdtgrp' in rdtgroup_mondata_show(), and return -ENOENT
immediately when reading mondata during the window of deleting a mon
group.
Fixes:
|
||
|---|---|---|
| .. | ||
| core.c | ||
| ctrlmondata.c | ||
| internal.h | ||
| Makefile | ||
| monitor.c | ||
| pseudo_lock_event.h | ||
| pseudo_lock.c | ||
| rdtgroup.c | ||