hulk inclusion category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/IA7L2U

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Before dom_data_init() initializing the monitor resource, we should check if the msc has the ability of monitor.

If the chip not having RDT monitor function, variable idx_limit in dom_data_init() would be set 0. rmid_ptrs points to an illegal buffer after kcalloc() allocation, which would cause illegal access fault when accessing.

Fixes: 13e249bf4944 ("x86/resctrl: Move the filesystem portions of resctrl to live in '/fs/'") Signed-off-by: Zeng Heng zengheng4@huawei.com --- fs/resctrl/monitor.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/fs/resctrl/monitor.c b/fs/resctrl/monitor.c index fcf2ab18966f..68401ca0827a 100644 --- a/fs/resctrl/monitor.c +++ b/fs/resctrl/monitor.c @@ -830,13 +830,13 @@ int resctrl_mon_resource_init(void) struct rdt_resource *r = resctrl_arch_get_resource(RDT_RESOURCE_L3); int ret;

+ if (!r->mon_capable) + return 0; + ret = dom_data_init(r); if (ret) return ret;

- if (!r->mon_capable) - return 0; - l3_mon_evt_init(r);

if (resctrl_arch_is_evt_configurable(QOS_L3_MBM_TOTAL_EVENT_ID)) {