From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751329AbbJLGQM (ORCPT ); Mon, 12 Oct 2015 02:16:12 -0400 Received: from youngberry.canonical.com ([91.189.89.112]:55199 "EHLO youngberry.canonical.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750890AbbJLGQK (ORCPT ); Mon, 12 Oct 2015 02:16:10 -0400 Subject: Re: [PATCH] powerpc/pseries/hvcserver: don't memset pi_buff if it is null To: Daniel Axtens , Benjamin Herrenschmidt , Paul Mackerras , Michael Ellerman , linuxppc-dev@lists.ozlabs.org References: <1444330858-5508-1-git-send-email-colin.king@canonical.com> <878u7853g7.fsf@gamma.ozlabs.ibm.com> Cc: linux-kernel@vger.kernel.org From: Colin Ian King Message-ID: <561B4FCC.5080907@canonical.com> Date: Mon, 12 Oct 2015 07:14:36 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.2.0 MIME-Version: 1.0 In-Reply-To: <878u7853g7.fsf@gamma.ozlabs.ibm.com> Content-Type: text/plain; charset=windows-1252 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA256 On 12/10/15 01:35, Daniel Axtens wrote: > > Hi Colin, > > This looks good. Out of curiousity, how did you find it? Code > inspection? Bug? Static analysis? static analysis with cppcheck. I forgot to mention that in the commit message. > > Not that it's particularly meaningful for such a trivial fix, but FWIW : > > Reviewed-by: Daniel Axtens > > Regards, > Daniel > > Colin King writes: > >> From: Colin Ian King >> >> pi_buff is being memset before it is sanity checked. Move the >> memset after the null pi_buff sanity check to avoid an oops. >> >> Signed-off-by: Colin Ian King >> --- >> arch/powerpc/platforms/pseries/hvcserver.c | 2 +- >> 1 file changed, 1 insertion(+), 1 deletion(-) >> >> diff --git a/arch/powerpc/platforms/pseries/hvcserver.c b/arch/powerp c/platforms/pseries/hvcserver.c >> index eedb645..94a6e56 100644 >> --- a/arch/powerpc/platforms/pseries/hvcserver.c >> +++ b/arch/powerpc/platforms/pseries/hvcserver.c >> @@ -142,11 +142,11 @@ int hvcs_get_partner_info(uint32_t unit_address , struct list_head *head, >> int more = 1; >> int retval; >> >> - memset(pi_buff, 0x00, PAGE_SIZE); >> /* invalid parameters */ >> if (!head || !pi_buff) >> return -EINVAL; >> >> + memset(pi_buff, 0x00, PAGE_SIZE); >> last_p_partition_ID = last_p_unit_address = ~0UL; >> INIT_LIST_HEAD(head); >> >> -- >> 2.5.0 >> >> _______________________________________________ >> Linuxppc-dev mailing list >> Linuxppc-dev@lists.ozlabs.org >> https://lists.ozlabs.org/listinfo/linuxppc-dev -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iQIcBAEBCAAGBQJWG0/KAAoJEGjCh9/GqAImcV8QAIToDexS4X/vya3F8aHZ2qtT idFEvgKl1mJxzgk79RJs874AiGs3CtOEC3/5w5fMh4eA/P6d6vJ1NPDu5bsugzzA I6F329WP/QxeOWgU13GSXxa0p13sUxTXqFRT8sHqwDgEaecX6kR+nf8x+P5pZUYX c7y25IHCZ/nNrj/QwQZcrlNd+U5bwxHyd5zUPJYYInbSEQmPUrhFhW1EkiUDVEYG 6rGmCzRGqfPS2sBqLXG/6ObP4FO8NC+bxQxNWAG/p9iWZg9KdIVL7IFTjWbxT7GC dsVbBsWu7ewUqo6euK56cd5CFf0oFDoHwhbDQ7T9b9CHYvGVWHxW1k7rUCgcep9x yJIIWOAVw78DemV3JkZm53Q2+1jUCYuaY6Vw8M3UmdQbWrg2rvbh8TtgoCiXbbrF HlNO0wlFOBpmr7LoHEPoIV8TsIeoeEikGrXszkqXI/MXKvN8jW1k5vtzcD3j+EU9 gy9wZvovvVZ6RL0erXwVLdzDp+R2clQfIcSi/St2/OGW+5X9NXtuaa+mvBy+dcpW Se0kO8DpLmHfNtcXvXJhCm77O1Oapw7s5UumevXSTibZ/Mhxzrdg+YhSWexm/SRu evcm6pagTpX3Vruq4BTt0Rdji9J/stT8GFlOWT0hGH1ZBLrzIKTlkJskSTkT801N +MkiI6UyL8lqdVoqZrNk =xqJ4 -----END PGP SIGNATURE-----