linux-kernel - [PATCH] x86/resctrl: Fix kfree() of the wrong type in domain_add

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Date:   Fri, 17 Sep 2021 16:59:24 +0000
From:   James Morse <james.morse@....com>
To:     x86@...nel.org, linux-kernel@...r.kernel.org
Cc:     Fenghua Yu <fenghua.yu@...el.com>,
        Reinette Chatre <reinette.chatre@...el.com>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        H Peter Anvin <hpa@...or.com>,
        Babu Moger <Babu.Moger@....com>,
        James Morse <james.morse@....com>,
        shameerali.kolothum.thodi@...wei.com,
        Jamie Iles <jamie@...iainc.com>,
        D Scott Phillips OS <scott@...amperecomputing.com>,
        lcherian@...vell.com, bobo.shaobowang@...wei.com
Subject: [PATCH] x86/resctrl: Fix kfree() of the wrong type in domain_add_cpu()

Commit 792e0f6f789b ("x86/resctrl: Split struct rdt_domain") separated
the architecture specific and filesystem parts of the resctrl domain
structures.

This left the error paths in domain_add_cpu() kfree()ing the memory
with the wrong type.

This will cause a problem if someone adds a new member to struct
rdt_hw_domain meaining d_resctrl is no longer the first member.

Fixes: 792e0f6f789b ("x86/resctrl: Split struct rdt_domain")
Signed-off-by: James Morse <james.morse@....com>
---
 arch/x86/kernel/cpu/resctrl/core.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index b5de5a6c115c..bb1c3f5f60c8 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -527,14 +527,14 @@ static void domain_add_cpu(int cpu, struct rdt_resource *r)
 	rdt_domain_reconfigure_cdp(r);
 
 	if (r->alloc_capable && domain_setup_ctrlval(r, d)) {
-		kfree(d);
+		kfree(hw_dom);
 		return;
 	}
 
 	if (r->mon_capable && domain_setup_mon_state(r, d)) {
 		kfree(hw_dom->ctrl_val);
 		kfree(hw_dom->mbps_val);
-		kfree(d);
+		kfree(hw_dom);
 		return;
 	}
 
-- 
2.30.2