linux-kernel - [PATCH 6.6 199/638] s390/pai: fix attr_event_free upper limit for pai device drivers

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Date: Sun, 24 Mar 2024 18:53:56 -0400
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org,
	stable@...r.kernel.org
Cc: Thomas Richter <tmricht@...ux.ibm.com>,
	Sumanth Korikkar <sumanthk@...ux.ibm.com>,
	Heiko Carstens <hca@...ux.ibm.com>,
	Sasha Levin <sashal@...nel.org>
Subject: [PATCH 6.6 199/638] s390/pai: fix attr_event_free upper limit for pai device drivers

From: Thomas Richter <tmricht@...ux.ibm.com>

[ Upstream commit 225d09d6e5f3870560665a1829d2db79330b4c58 ]

When the device drivers are initialized, a sysfs directory
is created. This contains many attributes which are allocated with
kzalloc(). Should it fail, the memory for the attributes already
created is freed in attr_event_free(). Its second parameter is number
of attribute elements to delete. This parameter is off by one.
When i. e. the 10th attribute fails to get created, attributes
numbered 0 to 9 should be deleted. Currently only attributes
numbered 0 to 8 are deleted.

Fixes: 39d62336f5c1 ("s390/pai: add support for cryptography counters")
Reported-by: Sumanth Korikkar <sumanthk@...ux.ibm.com>
Signed-off-by: Thomas Richter <tmricht@...ux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@...ux.ibm.com>
Signed-off-by: Heiko Carstens <hca@...ux.ibm.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 arch/s390/kernel/perf_pai_crypto.c | 2 +-
 arch/s390/kernel/perf_pai_ext.c    | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/arch/s390/kernel/perf_pai_crypto.c b/arch/s390/kernel/perf_pai_crypto.c
index fe7d1774ded18..4a4e914c283c8 100644
--- a/arch/s390/kernel/perf_pai_crypto.c
+++ b/arch/s390/kernel/perf_pai_crypto.c
@@ -646,7 +646,7 @@ static int __init attr_event_init(void)
 	for (i = 0; i < ARRAY_SIZE(paicrypt_ctrnames); i++) {
 		ret = attr_event_init_one(attrs, i);
 		if (ret) {
-			attr_event_free(attrs, i - 1);
+			attr_event_free(attrs, i);
 			return ret;
 		}
 	}
diff --git a/arch/s390/kernel/perf_pai_ext.c b/arch/s390/kernel/perf_pai_ext.c
index c57c1a203256f..b5febe22d0546 100644
--- a/arch/s390/kernel/perf_pai_ext.c
+++ b/arch/s390/kernel/perf_pai_ext.c
@@ -607,7 +607,7 @@ static int __init attr_event_init(void)
 	for (i = 0; i < ARRAY_SIZE(paiext_ctrnames); i++) {
 		ret = attr_event_init_one(attrs, i);
 		if (ret) {
-			attr_event_free(attrs, i - 1);
+			attr_event_free(attrs, i);
 			return ret;
 		}
 	}
-- 
2.43.0