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livepatch-patch-hook: check for object->name before calling strcmp

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Fixes issue #494. A null pointer dereference can result with patch
modules for multiple objects since the "vmlinux" patch object's "name"
field is null. strcmp therefore crashes trying to compare object->name
if the current object is vmlinux and the supplied "name" argument is
not. Check that object->name is not null before invoking strcmp.
This commit is contained in:
Jessica Yu 2015-10-14 12:48:30 -07:00
parent 403490fff5
commit 9e223369ea
1 changed files with 1 additions and 1 deletions
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2
kmod/patch/livepatch-patch-hook.c
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@ -91,7 +91,7 @@ static struct patch_object *patch_find_object_by_name(const char *name)
list_for_each_entry(object, &patch_objects, list)
if ((!strcmp(name, "vmlinux") && !object->name) ||
!strcmp(object->name, name))
(object->name && !strcmp(object->name, name)))
return object;
return patch_alloc_new_object(name);
}