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a=ed25519; pk=tC3hNkJQTpNX/gLKxTNQKDmiQl6QjBNCGKJINqAdJsE= X-Developer-Signature: v=1; a=ed25519-sha256; t=1697573487; l=2638; i=justinstitt@google.com; s=20230717; h=from:subject:message-id; bh=zJRX9bfYMLnf8bwx/y1SqZRLrWT3yCChHrc9KJ+aw0g=; b=36Wx10SOxayn+TXLBPF3Sdbo+ZOjyWFKEXOZQUWfzf/HDZaBLlDvUd/FbJiQtsFySN1BKVG9K S2f9g+oP7StAX9U5Iv2XSJNPkbxap07eIIAsrMoZPt/V36oDC327Jgg X-Mailer: b4 0.12.3 Message-ID: <20231017-strncpy-drivers-net-wireless-broadcom-brcm80211-brcmfmac-cfg80211-c-v3-2-af780d74ae38@google.com> Subject: [PATCH v3 2/2] wifi: brcmsmac: replace deprecated strncpy with memcpy From: Justin Stitt To: Arend van Spriel , Franky Lin , Hante Meuleman , Kalle Valo Cc: linux-wireless@vger.kernel.org, brcm80211-dev-list.pdl@broadcom.com, SHA-cyfmac-dev-list@infineon.com, linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org, Justin Stitt X-Spam-Status: No, score=-8.4 required=5.0 tests=DKIMWL_WL_MED,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lipwig.vger.email Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-Greylist: Sender passed SPF test, not delayed by milter-greylist-4.6.4 (lipwig.vger.email [0.0.0.0]); Tue, 17 Oct 2023 13:12:04 -0700 (PDT) X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: 1780034863723563554 X-GMAIL-MSGID: 1780034863723563554 Let's move away from using strncpy and instead use the more obvious interface for this context. For wlc->pub->srom_ccode, we're just copying two bytes from ccode into wlc->pub->srom_ccode with no expectation that srom_ccode be NUL-terminated: wlc->pub->srom_ccode is only used in regulatory_hint(): 1193 | if (wl->pub->srom_ccode[0] && 1194 | regulatory_hint(wl->wiphy, wl->pub->srom_ccode)) 1195 | wiphy_err(wl->wiphy, "%s: regulatory hint failed\n", __func__); We can see that only index 0 and index 1 are accessed. 3307 | int regulatory_hint(struct wiphy *wiphy, const char *alpha2) 3308 | { ... | ... 3322 | request->alpha2[0] = alpha2[0]; 3323 | request->alpha2[1] = alpha2[1]; ... | ... 3332 | } Since this is just a simple byte copy with correct lengths, let's use memcpy(). There should be no functional change. In a similar boat, both wlc->country_default and wlc->autocountry_default are just simple byte copies so let's use memcpy. However, FWICT they aren't used anywhere. (they should be used or removed -- not in scope of my patch, though). Signed-off-by: Justin Stitt Reviewed-by: Kees Cook --- drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c index 5a6d9c86552a..f6962e558d7c 100644 --- a/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c +++ b/drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.c @@ -341,7 +341,7 @@ struct brcms_cm_info *brcms_c_channel_mgr_attach(struct brcms_c_info *wlc) /* store the country code for passing up as a regulatory hint */ wlc_cm->world_regd = brcms_world_regd(ccode, ccode_len); if (brcms_c_country_valid(ccode)) - strncpy(wlc->pub->srom_ccode, ccode, ccode_len); + memcpy(wlc->pub->srom_ccode, ccode, ccode_len); /* * If no custom world domain is found in the SROM, use the @@ -354,10 +354,10 @@ struct brcms_cm_info *brcms_c_channel_mgr_attach(struct brcms_c_info *wlc) } /* save default country for exiting 11d regulatory mode */ - strncpy(wlc->country_default, ccode, ccode_len); + memcpy(wlc->country_default, ccode, ccode_len); /* initialize autocountry_default to driver default */ - strncpy(wlc->autocountry_default, ccode, ccode_len); + memcpy(wlc->autocountry_default, ccode, ccode_len); brcms_c_set_country(wlc_cm, wlc_cm->world_regd);