linux-kernel - [PATCH] tracing/syscalls: Use kcalloc instead of kzalloc to allocate array

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Message-ID: <1322600880.1534.347.camel@localhost.localdomain>
Date:	Tue, 29 Nov 2011 22:08:00 +0100
From:	Thomas Meyer <thomas@...3r.de>
To:	rostedt@...dmis.org, fweisbec@...il.com, mingo@...hat.com,
	linux-kernel@...r.kernel.org
Subject: [PATCH] tracing/syscalls: Use kcalloc instead of kzalloc to
 allocate array

The advantage of kcalloc is, that will prevent integer overflows which could
result from the multiplication of number of elements and size and it is also
a bit nicer to read.

The semantic patch that makes this change is available
in https://lkml.org/lkml/2011/11/25/107

Signed-off-by: Thomas Meyer <thomas@...3r.de>
---

diff -u -p a/kernel/trace/ftrace.c b/kernel/trace/ftrace.c
--- a/kernel/trace/ftrace.c 2011-11-13 11:08:12.084207678 +0100
+++ b/kernel/trace/ftrace.c 2011-11-28 20:09:21.703638214 +0100
@@ -1131,7 +1131,7 @@ static struct ftrace_hash *alloc_ftrace_
 		return NULL;
 
 	size = 1 << size_bits;
-	hash->buckets = kzalloc(sizeof(*hash->buckets) * size, GFP_KERNEL);
+	hash->buckets = kcalloc(size, sizeof(*hash->buckets), GFP_KERNEL);
 
 	if (!hash->buckets) {
 		kfree(hash);
diff -u -p a/kernel/trace/trace_events_filter.c b/kernel/trace/trace_events_filter.c
--- a/kernel/trace/trace_events_filter.c 2011-11-13 11:08:12.107541380 +0100
+++ b/kernel/trace/trace_events_filter.c 2011-11-28 20:09:19.846949470 +0100
@@ -679,7 +679,7 @@ find_event_field(struct ftrace_event_cal
 
 static int __alloc_pred_stack(struct pred_stack *stack, int n_preds)
 {
-	stack->preds = kzalloc(sizeof(*stack->preds)*(n_preds + 1), GFP_KERNEL);
+	stack->preds = kcalloc(n_preds + 1, sizeof(*stack->preds), GFP_KERNEL);
 	if (!stack->preds)
 		return -ENOMEM;
 	stack->index = n_preds;
@@ -820,8 +820,7 @@ static int __alloc_preds(struct event_fi
 	if (filter->preds)
 		__free_preds(filter);
 
-	filter->preds =
-		kzalloc(sizeof(*filter->preds) * n_preds, GFP_KERNEL);
+	filter->preds = kcalloc(n_preds, sizeof(*filter->preds), GFP_KERNEL);
 
 	if (!filter->preds)
 		return -ENOMEM;
@@ -1480,7 +1479,7 @@ static int fold_pred(struct filter_pred
 	children = count_leafs(preds, &preds[root->left]);
 	children += count_leafs(preds, &preds[root->right]);
 
-	root->ops = kzalloc(sizeof(*root->ops) * children, GFP_KERNEL);
+	root->ops = kcalloc(children, sizeof(*root->ops), GFP_KERNEL);
 	if (!root->ops)
 		return -ENOMEM;
 
diff -u -p a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
--- a/kernel/trace/trace_syscalls.c 2011-11-13 11:08:12.124208310 +0100
+++ b/kernel/trace/trace_syscalls.c 2011-11-28 20:09:23.100321500 +0100
@@ -468,8 +468,8 @@ int __init init_ftrace_syscalls(void)
 	unsigned long addr;
 	int i;
 
-	syscalls_metadata = kzalloc(sizeof(*syscalls_metadata) *
-					NR_syscalls, GFP_KERNEL);
+	syscalls_metadata = kcalloc(NR_syscalls, sizeof(*syscalls_metadata),
+				    GFP_KERNEL);
 	if (!syscalls_metadata) {
 		WARN_ON(1);
 		return -ENOMEM;
--
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