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

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Date:   Mon, 04 Oct 2021 16:47:32 -0000
From:   "tip-bot2 for James Morse" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     James Morse <james.morse@....com>, Borislav Petkov <bp@...e.de>,
        Reinette Chatre <reinette.chatre@...el.com>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/urgent] x86/resctrl: Fix kfree() of the wrong type in
 domain_add_cpu()

The following commit has been merged into the x86/urgent branch of tip:

Commit-ID:     c51dd7e26b38b98e303f645ac18587d86eab2a73
Gitweb:        https://git.kernel.org/tip/c51dd7e26b38b98e303f645ac18587d86eab2a73
Author:        James Morse <james.morse@....com>
AuthorDate:    Fri, 17 Sep 2021 16:59:24 
Committer:     Borislav Petkov <bp@...e.de>
CommitterDate: Mon, 04 Oct 2021 18:36:14 +02:00

x86/resctrl: Fix kfree() of the wrong type in domain_add_cpu()

Commit in Fixes 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 meaning d_resctrl is no longer the first member.

Fixes: 792e0f6f789b ("x86/resctrl: Split struct rdt_domain")
Signed-off-by: James Morse <james.morse@....com>
Signed-off-by: Borislav Petkov <bp@...e.de>
Acked-by: Reinette Chatre <reinette.chatre@...el.com>
Link: https://lkml.kernel.org/r/20210917165924.28254-1-james.morse@arm.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 b5de5a6..bb1c3f5 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;
 	}