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driver core: check start node in klist_iter_init_node

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klist_iter_init_node() takes a node as a start argument.
However, this node might not be valid anymore.
This patch updates the klist_iter_init_node() and
dependent functions to return an error if so.
All calling functions have been audited to check
for a return code here.

Signed-off-by: Hannes Reinecke <[email protected]>
Cc: Greg Kroah-Hartmann <[email protected]>
Cc: Kay Sievers <[email protected]>
Cc: Stable Kernel <[email protected]>
Cc: Linux Kernel <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Hannes Reinecke 2012-04-16 15:06:25 +02:00 • committed by Greg Kroah-Hartman
commit a15d49fd30
6 changed files with 76 additions and 46 deletions
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14
lib/klist.c
View file

@ -278,13 +278,19 @@ EXPORT_SYMBOL_GPL(klist_node_attached);
* Similar to klist_iter_init(), but starts the action off with @n,
* instead of with the list head.
*/
void klist_iter_init_node(struct klist *k, struct klist_iter *i,
struct klist_node *n)
int klist_iter_init_node(struct klist *k, struct klist_iter *i,
struct klist_node *n)
{
if (n) {
kref_get(&n->n_ref);
if (!n->n_klist) {
kref_put(&n->n_ref);
return -ENODEV;
}
}
i->i_klist = k;
i->i_cur = n;
if (n)
kref_get(&n->n_ref);
return 0;
}
EXPORT_SYMBOL_GPL(klist_iter_init_node);