In the Linux kernel, the following vulnerability has been resolved:
pcmcia: Fix a NULL pointer dereference in _iodynfindioregion()
In _iodynfindioregion(), pcmciamakeresource() is assigned to res and used in pcibusallocresource(). There is a dereference of res in pcibusallocresource(), which could lead to a NULL pointer dereference on failure of pcmciamakeresource().
Fix this bug by adding a check of res.