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From: Colin King <colin.king@canonical.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] x86/events/amd/iommu: fix sizeof mismatch
Date: Thu,  1 Oct 2020 12:39:00 +0100	[thread overview]
Message-ID: <20201001113900.58889-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

An incorrect sizeof is being used, struct attribute ** is not correct,
it should be struct attribute *. Note that since ** is the same size as
* this is not causing any issues.  Improve this fix by using sizeof(*attrs)
as this allows us to not even reference the type of the pointer.

Addresses-Coverity: ("Sizeof not portable (SIZEOF_MISMATCH)")
Fixes: 51686546304f ("x86/events/amd/iommu: Fix sysfs perf attribute groups")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 arch/x86/events/amd/iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c
index fb616203ce42..be50ef8572cc 100644
--- a/arch/x86/events/amd/iommu.c
+++ b/arch/x86/events/amd/iommu.c
@@ -379,7 +379,7 @@ static __init int _init_events_attrs(void)
 	while (amd_iommu_v2_event_descs[i].attr.attr.name)
 		i++;
 
-	attrs = kcalloc(i + 1, sizeof(struct attribute **), GFP_KERNEL);
+	attrs = kcalloc(i + 1, sizeof(*attrs), GFP_KERNEL);
 	if (!attrs)
 		return -ENOMEM;
 
-- 
2.27.0


WARNING: multiple messages have this Message-ID (diff)
From: Colin King <colin.king@canonical.com>
To: Peter Zijlstra <peterz@infradead.org>,
	Ingo Molnar <mingo@redhat.com>,
	Arnaldo Carvalho de Melo <acme@kernel.org>,
	Mark Rutland <mark.rutland@arm.com>,
	Alexander Shishkin <alexander.shishkin@linux.intel.com>,
	Jiri Olsa <jolsa@redhat.com>, Namhyung Kim <namhyung@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	x86@kernel.org, "H . Peter Anvin" <hpa@zytor.com>,
	Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Cc: kernel-janitors@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [PATCH] x86/events/amd/iommu: fix sizeof mismatch
Date: Thu, 01 Oct 2020 11:39:00 +0000	[thread overview]
Message-ID: <20201001113900.58889-1-colin.king@canonical.com> (raw)

From: Colin Ian King <colin.king@canonical.com>

An incorrect sizeof is being used, struct attribute ** is not correct,
it should be struct attribute *. Note that since ** is the same size as
* this is not causing any issues.  Improve this fix by using sizeof(*attrs)
as this allows us to not even reference the type of the pointer.

Addresses-Coverity: ("Sizeof not portable (SIZEOF_MISMATCH)")
Fixes: 51686546304f ("x86/events/amd/iommu: Fix sysfs perf attribute groups")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
---
 arch/x86/events/amd/iommu.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/events/amd/iommu.c b/arch/x86/events/amd/iommu.c
index fb616203ce42..be50ef8572cc 100644
--- a/arch/x86/events/amd/iommu.c
+++ b/arch/x86/events/amd/iommu.c
@@ -379,7 +379,7 @@ static __init int _init_events_attrs(void)
 	while (amd_iommu_v2_event_descs[i].attr.attr.name)
 		i++;
 
-	attrs = kcalloc(i + 1, sizeof(struct attribute **), GFP_KERNEL);
+	attrs = kcalloc(i + 1, sizeof(*attrs), GFP_KERNEL);
 	if (!attrs)
 		return -ENOMEM;
 
-- 
2.27.0

             reply	other threads:[~2020-10-01 11:39 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-01 11:39 Colin King [this message]
2020-10-01 11:39 ` [PATCH] x86/events/amd/iommu: fix sizeof mismatch Colin King
2020-10-05  7:53 ` [tip: perf/core] x86/events/amd/iommu: Fix " tip-bot2 for Colin Ian King

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