Messages in this thread | | | Date | Thu, 13 Sep 2012 14:43:00 +0200 | From | Peter Oberparleiter <> | Subject | Re: [patch] gcov: cleanup an allocation in new_node() |
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On 11.09.2012 13:13, Dan Carpenter wrote: > 1) kcalloc(1, ...) can be replaced with kzalloc(). > 2) There was a small leak if the debugfs_create_dir() fails. > 3) I removed a pr_warning("out of memory\n") because kmalloc() already > prints a more useful failure message in the unlikely case of an > allocation failure. > > Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com> > > diff --git a/kernel/gcov/fs.c b/kernel/gcov/fs.c > index 9bd0934..132168f 100644 > --- a/kernel/gcov/fs.c > +++ b/kernel/gcov/fs.c > @@ -437,7 +437,7 @@ static struct gcov_node *new_node(struct gcov_node *parent, > if (!node) > goto err_nomem; > if (info) { > - node->loaded_info = kcalloc(1, sizeof(struct gcov_info *), > + node->loaded_info = kzalloc(sizeof(struct gcov_info *), > GFP_KERNEL);
I'd like to keep using kcalloc here since node->loaded_info is an array.
> if (!node->loaded_info) > goto err_nomem; > @@ -451,8 +451,7 @@ static struct gcov_node *new_node(struct gcov_node *parent, > node->dentry = debugfs_create_dir(node->name, parent->dentry); > if (!node->dentry) { > pr_warning("could not create file\n"); > - kfree(node); > - return NULL; > + goto err_info;
I agree that this is a potential memory leak - good find!
> } > if (info) > add_links(node, parent->dentry); > @@ -461,9 +460,11 @@ static struct gcov_node *new_node(struct gcov_node *parent, > > return node; > > +err_info: > + if (info) > + kfree(node->loaded_info);
The 'if' here is not necessary: node->loaded_info is either zero (kfree tolerates NULL) or requires freeing. With the removal of the pr_warning below, the additional kfree can also be added to err_nomem (no need for another label) though then it should probably also be renamed.
> err_nomem: > kfree(node); > - pr_warning("out of memory\n"); > return NULL; > } > >
Regards, Peter Oberparleiter
-- Peter Oberparleiter Linux on System z Development - IBM Germany
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