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tracing/trivial: Use kcalloc instead of kzalloc to allocate array

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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

Link: http://lkml.kernel.org/r/1322600880.1534.347.camel@localhost.localdomain

Signed-off-by: Thomas Meyer <thomas@m3y3r.de>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Thomas Meyer 2011-11-29 22:08:00 +01:00 committed by Steven Rostedt
parent 9510035849
commit 47b0edcb59
3 changed files with 6 additions and 7 deletions
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2
kernel/trace/ftrace.c
View File

@ -1129,7 +1129,7 @@ static struct ftrace_hash *alloc_ftrace_hash(int size_bits)
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);

7
kernel/trace/trace_events_filter.c
View File

@ -685,7 +685,7 @@ find_event_field(struct ftrace_event_call *call, char *name)
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;
@ -826,8 +826,7 @@ static int __alloc_preds(struct event_filter *filter, int n_preds)
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;
@ -1486,7 +1485,7 @@ static int fold_pred(struct filter_pred *preds, struct filter_pred *root)
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;

4
kernel/trace/trace_syscalls.c
View File

@ -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;