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Device properties framework fixes for 4.21-rc1 

Fix two potential NULL pointer dereferences found by Coverity in
 the software nodes code introduced recently (Colin Ian King).
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Merge tag 'devprop-4.21-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull device properties framework fixes from Rafael Wysocki:
 "Fix two potential NULL pointer dereferences found by Coverity in the
  software nodes code introduced recently (Colin Ian King)"

* tag 'devprop-4.21-rc1-2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  drivers: base: swnode: check if swnode is NULL before dereferencing it
  drivers: base: swnode: check if pointer p is NULL before dereferencing it
This commit is contained in:
Linus Torvalds 2019-01-02 18:43:57 -08:00
parent 35ddb06a46 f4747b9c68
commit 01766d27d2
1 changed files with 3 additions and 2 deletions
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5
drivers/base/swnode.c
View File

@ -477,7 +477,8 @@ software_node_get_parent(const struct fwnode_handle *fwnode)
{
struct software_node *swnode = to_software_node(fwnode);
return swnode->parent ? &swnode->parent->fwnode : NULL;
return swnode ? (swnode->parent ? &swnode->parent->fwnode : NULL) :
NULL;
}
struct fwnode_handle *
@ -487,7 +488,7 @@ software_node_get_next_child(const struct fwnode_handle *fwnode,
struct software_node *p = to_software_node(fwnode);
struct software_node *c = to_software_node(child);
if (list_empty(&p->children) ||
if (!p || list_empty(&p->children) ||
(c && list_is_last(&c->entry, &p->children)))
return NULL;