From mboxrd@z Thu Jan 1 00:00:00 1970 From: David Woodhouse Subject: Re: EFI: Stash ROMs if they're not in the PCI BAR Date: Fri, 15 Mar 2013 08:57:52 +0000 Message-ID: <1363337872.2444.9.camel@shinybook.infradead.org> References: <20130315082928.GA14520@longonot.mountain> Mime-Version: 1.0 Content-Type: multipart/signed; micalg="sha1"; protocol="application/x-pkcs7-signature"; boundary="=-F3dl3m7F6oX49jhBPgB+" Return-path: In-Reply-To: <20130315082928.GA14520-dZEljifmRObu9KfB+GxooP8+0UxHXcjY@public.gmane.org> Sender: linux-efi-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: Dan Carpenter Cc: matthew.garrett-05XSO3Yj/JvQT0dZR+AlfA@public.gmane.org, linux-efi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org List-Id: linux-efi@vger.kernel.org --=-F3dl3m7F6oX49jhBPgB+ Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On Fri, 2013-03-15 at 11:29 +0300, Dan Carpenter wrote: > Hello Matthew Garrett, >=20 > The patch dd5fc854de5f: "EFI: Stash ROMs if they're not in the PCI=20 > BAR" from Dec 5, 2012, leads to the following warning: > "arch/x86/boot/compressed/eboot.c:290 setup_efi_pci() > error: potentially dereferencing uninitialized 'pci_handle'." >=20 > 254 static efi_status_t setup_efi_pci(struct boot_params *params) > 255 { > 256 efi_pci_io_protocol *pci; > 257 efi_status_t status; > 258 void **pci_handle; > 259 efi_guid_t pci_proto =3D EFI_PCI_IO_PROTOCOL_GUID; > 260 unsigned long nr_pci, size =3D 0; > 261 int i; > 262 struct setup_data *data; > 263 =20 > 264 data =3D (struct setup_data *)(unsigned long)params->hdr.s= etup_data; > 265 =20 > 266 while (data && data->next) > 267 data =3D (struct setup_data *)(unsigned long)data-= >next; > 268 =20 > 269 status =3D efi_call_phys5(sys_table->boottime->locate_hand= le, > 270 EFI_LOCATE_BY_PROTOCOL, &pci_proto= , > 271 NULL, &size, pci_handle); > ^^^^^^^^^^ > This hasn't been initialized yet. True. It probably doesn't *matter* because the size is zero so the firmware is just going to ignore the pointer anyway. Although in that case I wonder why we couldn't have just passed NULL. 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