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powerpc/imc-pmu: Add a null pointer check in update_events_in_group()

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[ Upstream commit 0a233867a39078ebb0f575e2948593bbff5826b3 ]

kasprintf() returns a pointer to dynamically allocated memory
which can be NULL upon failure.

Fixes: 885dcd709ba9 ("powerpc/perf: Add nest IMC PMU support")
Signed-off-by: Kunwu Chan <chentao@kylinos.cn>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231126093719.1440305-1-chentao@kylinos.cn
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Kunwu Chan 2023-11-26 17:37:19 +08:00 committed by Greg Kroah-Hartman
parent 9da4a56dd3
commit 1e80aa25d1
1 changed files with 6 additions and 0 deletions
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6
arch/powerpc/perf/imc-pmu.c
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@ -292,6 +292,8 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
attr_group->attrs = attrs;
do {
ev_val_str = kasprintf(GFP_KERNEL, "event=0x%x", pmu->events[i].value);
if (!ev_val_str)
continue;
dev_str = device_str_attr_create(pmu->events[i].name, ev_val_str);
if (!dev_str)
continue;
@ -299,6 +301,8 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
attrs[j++] = dev_str;
if (pmu->events[i].scale) {
ev_scale_str = kasprintf(GFP_KERNEL, "%s.scale", pmu->events[i].name);
if (!ev_scale_str)
continue;
dev_str = device_str_attr_create(ev_scale_str, pmu->events[i].scale);
if (!dev_str)
continue;
@ -308,6 +312,8 @@ static int update_events_in_group(struct device_node *node, struct imc_pmu *pmu)
if (pmu->events[i].unit) {
ev_unit_str = kasprintf(GFP_KERNEL, "%s.unit", pmu->events[i].name);
if (!ev_unit_str)
continue;
dev_str = device_str_attr_create(ev_unit_str, pmu->events[i].unit);
if (!dev_str)
continue;