[PATCH 6.7 231/713] s390/pai: fix attr_event_free upper limit for pai device drivers

Sasha Levin
2024-03-24T22:51:08Z

From: Thomas Richter <tmricht@linux.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@linux.ibm.com>
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Acked-by: Sumanth Korikkar <sumanthk@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Sasha Levin <sashal@kernel.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 39a91b00438a7..fc2dff1e4f796 100644
--- a/arch/s390/kernel/perf_pai_crypto.c
+++ b/arch/s390/kernel/perf_pai_crypto.c
@@ -715,7 +715,7 @@ 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 e7013a2e89605..32b467c300603 100644
--- a/arch/s390/kernel/perf_pai_ext.c
+++ b/arch/s390/kernel/perf_pai_ext.c
@@ -604,7 +604,7 @@ 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