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[198.145.64.163]) by smtp.gmail.com with ESMTPSA id gm2sm12289154pjb.21.2022.01.14.20.24.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Jan 2022 20:24:29 -0800 (PST) From: Kees Cook To: Greg Kroah-Hartman Cc: Kees Cook , Larry Finger , Phillip Potter , Michael Straube , Fabio Aiuto , linux-staging@lists.linux.dev, Florian Schilhabel , Christophe JAILLET , Zhansaya Bagdauletkyzy , Ivan Safonov , Martin Kaiser , Yang Li , Nathan Chancellor , Hans de Goede , Dan Carpenter , Marco Cesati , Joe Perches , "Fabio M. De Francesco" , linux-kernel@vger.kernel.org, linux-hardening@vger.kernel.org Subject: [PATCH 2/3 v2] staging: rtl8723bs: Drop get_recvframe_data() Date: Fri, 14 Jan 2022 20:24:26 -0800 Message-Id: <20220115042427.824542-3-keescook@chromium.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220115042427.824542-1-keescook@chromium.org> References: <20220115042427.824542-1-keescook@chromium.org> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=5267; h=from:subject; bh=Z6Wfwf6J3jPxC9N20ooqglvng7tGlFpo9yMXY4ONGgY=; b=owEBbQKS/ZANAwAKAYly9N/cbcAmAcsmYgBh4kx6rMJrMC8W6yDUxFp3e6Z57hAL5JlEjMqwbMfu kf+UFhiJAjMEAAEKAB0WIQSlw/aPIp3WD3I+bhOJcvTf3G3AJgUCYeJMegAKCRCJcvTf3G3AJlkjEA CN3vYikUMRVE1xXmmwivQxstd/0eGne+wIQ8+LnWOwICl8klblpN1AFhgS3Y/9hgjAS5x57pVHmCRx av8TgSTDdrseku8EpUGz/ljcMWrxLNMMKpIXznB1RUzXihOdbCB0ivOpbPZWcxtUruGf/WaQHGDMx1 0FA7jJrzJqr6HTIJni65+NxZAsnxr0Qm7FMFbqmk57Iu1PfFN3Q3L8UqQsDLHeZ49ZUKntwxk0l445 1a2KS0Bq9HBnDOvUlF2k7199hZx6KWlF/FCwqaif350logcFak5t7TZic6Wk/aH/4KuLf95Tfto6yn P+bvZvEsZBCbTLJXcA0g222Rj0w6vd3GuZJn4sND0kLN/STj8cVQZJL6K6I1s7K+5oTSmNi7h9zCzY 26u1cRWYThdRbK4IyWxfYBfzlRP2kCwFUmhwx8CeHObDk6hu1LE6fz7hP8B+TGxd+hk/u7Qc3JYkNW WO3QK5gjydWXyZfch1Fho8xmjPf9QvbJKk3Q7nSUURiXKXthQzj2DpkVqh25x+PMkgb/prjw7BrTHT TGoppmDZ8RVlx5vwDpS8v0XnqAQ+LJPxUXS4cIqC49eMjOHx3/dgcGQmED5ACd8YfDtvSRAKB2jvoS iaM74RSQP6mtEgk2fPhOcaLO4WBObxhAyQHw44WpMWddwxgRDusr/rQPAGBA== X-Developer-Key: i=keescook@chromium.org; a=openpgp; fpr=A5C3F68F229DD60F723E6E138972F4DFDC6DC026 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org When building with -Warray-bounds, the following warning is emitted: In file included from ./include/linux/string.h:253, from ./arch/x86/include/asm/page_32.h:22, from ./arch/x86/include/asm/page.h:14, from ./arch/x86/include/asm/thread_info.h:12, from ./include/linux/thread_info.h:60, from ./arch/x86/include/asm/preempt.h:7, from ./include/linux/preempt.h:78, from ./include/linux/rcupdate.h:27, from ./include/linux/rculist.h:11, from ./include/linux/sched/signal.h:5, from ./drivers/staging/rtl8723bs/include/drv_types.h:17, from drivers/staging/rtl8723bs/core/rtw_recv.c:7: In function 'memcpy', inlined from 'wlanhdr_to_ethhdr' at drivers/staging/rtl8723bs/core/rtw_recv.c:1554:2: ./include/linux/fortify-string.h:41:33: warning: '__builtin_memcpy' offset [0, 5] is out of the bounds [0, 0] [-Warray-bounds] 41 | #define __underlying_memcpy __builtin_memcpy | ^ This is because the compiler sees it is possible for "ptr" to be a NULL value, and concludes that it has zero size and attempts to copy to it would overflow. Instead, remove the get_recvframe_data() entirely, as it's not possible for this to ever be NULL. Additionally add missing NULL checks after recvframe_pull() (which are present in the rtl8712 driver). Cc: Larry Finger Cc: Phillip Potter Cc: Greg Kroah-Hartman Cc: Michael Straube Cc: Fabio Aiuto Cc: linux-staging@lists.linux.dev Signed-off-by: Kees Cook --- drivers/staging/rtl8723bs/core/rtw_recv.c | 11 ++++++++--- drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c | 3 +-- drivers/staging/rtl8723bs/include/rtw_recv.h | 11 ----------- 3 files changed, 9 insertions(+), 16 deletions(-) diff --git a/drivers/staging/rtl8723bs/core/rtw_recv.c b/drivers/staging/rtl8723bs/core/rtw_recv.c index 41bfca549c64..ffb455688a7d 100644 --- a/drivers/staging/rtl8723bs/core/rtw_recv.c +++ b/drivers/staging/rtl8723bs/core/rtw_recv.c @@ -465,7 +465,7 @@ static union recv_frame *portctrl(struct adapter *adapter, union recv_frame *pre auth_alg = adapter->securitypriv.dot11AuthAlgrthm; - ptr = get_recvframe_data(precv_frame); + ptr = precvframe->u.hdr.rx_data; pfhdr = &precv_frame->u.hdr; pattrib = &pfhdr->attrib; psta_addr = pattrib->ta; @@ -1510,7 +1510,7 @@ static signed int wlanhdr_to_ethhdr(union recv_frame *precvframe) __be16 be_tmp; struct adapter *adapter = precvframe->u.hdr.adapter; struct mlme_priv *pmlmepriv = &adapter->mlmepriv; - u8 *ptr = get_recvframe_data(precvframe) ; /* point to frame_ctrl field */ + u8 *ptr = precvframe->u.hdr.rx_data; /* point to frame_ctrl field */ struct rx_pkt_attrib *pattrib = &precvframe->u.hdr.attrib; if (pattrib->encrypt) @@ -1546,10 +1546,15 @@ static signed int wlanhdr_to_ethhdr(union recv_frame *precvframe) eth_type = 0x8712; /* append rx status for mp test packets */ ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr)+2)-24); + if (!ptr) + return _FAIL; memcpy(ptr, get_rxmem(precvframe), 24); ptr += 24; - } else + } else { ptr = recvframe_pull(precvframe, (rmv_len-sizeof(struct ethhdr) + (bsnaphdr?2:0))); + if (!ptr) + return _FAIL; + } memcpy(ptr, pattrib->dst, ETH_ALEN); memcpy(ptr+ETH_ALEN, pattrib->src, ETH_ALEN); diff --git a/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c b/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c index c0a1a6fbeb91..74e75dc970f7 100644 --- a/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c +++ b/drivers/staging/rtl8723bs/hal/rtl8723bs_recv.c @@ -81,7 +81,7 @@ static void update_recvframe_phyinfo(union recv_frame *precvframe, struct odm_phy_info *p_phy_info = (struct odm_phy_info *)(&pattrib->phy_info); - u8 *wlanhdr; + u8 *wlanhdr = precvframe->u.hdr.rx_data; u8 *my_bssid; u8 *rx_bssid; u8 *rx_ra; @@ -100,7 +100,6 @@ static void update_recvframe_phyinfo(union recv_frame *precvframe, struct sta_priv *pstapriv; struct sta_info *psta; - wlanhdr = get_recvframe_data(precvframe); my_bssid = get_bssid(&padapter->mlmepriv); rx_bssid = get_hdr_bssid(wlanhdr); pkt_info.bssid_match = ((!IsFrameTypeCtrl(wlanhdr)) && diff --git a/drivers/staging/rtl8723bs/include/rtw_recv.h b/drivers/staging/rtl8723bs/include/rtw_recv.h index a88b7c088a86..44f67103503a 100644 --- a/drivers/staging/rtl8723bs/include/rtw_recv.h +++ b/drivers/staging/rtl8723bs/include/rtw_recv.h @@ -385,17 +385,6 @@ static inline u8 *get_rxmem(union recv_frame *precvframe) return precvframe->u.hdr.rx_head; } -static inline u8 *get_recvframe_data(union recv_frame *precvframe) -{ - - /* alwasy return rx_data */ - if (precvframe == NULL) - return NULL; - - return precvframe->u.hdr.rx_data; - -} - static inline u8 *recvframe_pull(union recv_frame *precvframe, signed int sz) { /* rx_data += sz; move rx_data sz bytes hereafter */ -- 2.30.2