[tip: perf/urgent] perf/x86/rapl: Fix error handling in init_rapl_pmus()

From: tip-bot2 for Dhananjay Ugwekar
Date: Thu Mar 20 2025 - 16:16:12 EST


The following commit has been merged into the perf/urgent branch of tip:

Commit-ID: 7e512f5ad24458e2c930b5be5d96ddf9e176e05d
Gitweb: https://git.kernel.org/tip/7e512f5ad24458e2c930b5be5d96ddf9e176e05d
Author: Dhananjay Ugwekar <dhananjay.ugwekar@xxxxxxx>
AuthorDate: Thu, 20 Mar 2025 10:06:19
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitterDate: Thu, 20 Mar 2025 21:03:55 +01:00

perf/x86/rapl: Fix error handling in init_rapl_pmus()

If init_rapl_pmu() fails while allocating memory for "rapl_pmu" objects,
we miss freeing the "rapl_pmus" object in the error path. Fix that.

Fixes: 9b99d65c0bb4 ("perf/x86/rapl: Move the pmu allocation out of CPU hotplug")
Signed-off-by: Dhananjay Ugwekar <dhananjay.ugwekar@xxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20250320100617.4480-1-dhananjay.ugwekar@xxxxxxx
---
arch/x86/events/rapl.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/arch/x86/events/rapl.c b/arch/x86/events/rapl.c
index 6941f48..043f0a0 100644
--- a/arch/x86/events/rapl.c
+++ b/arch/x86/events/rapl.c
@@ -730,6 +730,7 @@ static int __init init_rapl_pmus(struct rapl_pmus **rapl_pmus_ptr, int rapl_pmu_
{
int nr_rapl_pmu = topology_max_packages();
struct rapl_pmus *rapl_pmus;
+ int ret;

/*
* rapl_pmu_scope must be either PKG, DIE or CORE
@@ -761,7 +762,11 @@ static int __init init_rapl_pmus(struct rapl_pmus **rapl_pmus_ptr, int rapl_pmu_
rapl_pmus->pmu.module = THIS_MODULE;
rapl_pmus->pmu.capabilities = PERF_PMU_CAP_NO_EXCLUDE;

- return init_rapl_pmu(rapl_pmus);
+ ret = init_rapl_pmu(rapl_pmus);
+ if (ret)
+ kfree(rapl_pmus);
+
+ return ret;
}

static struct rapl_model model_snb = {