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R. Silva" To: Kalle Valo , "David S. Miller" , Maxime Coquelin , Alexandre Torgue Subject: [PATCH] wcn36xx: Replace zero-length array with flexible-array Message-ID: <20200507151758.GA4962@embeddedor> MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200507_081334_862188_B63F3DF5 X-CRM114-Status: GOOD ( 12.91 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Gustavo A. R. Silva" , netdev@vger.kernel.org, linux-wireless@vger.kernel.org, linux-kernel@vger.kernel.org, wcn36xx@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org The current codebase makes use of the zero-length array language extension to the C90 standard, but the preferred mechanism to declare variable-length types such as these ones is a flexible array member[1][2], introduced in C99: struct foo { int stuff; struct boo array[]; }; By making use of the mechanism above, we will get a compiler warning in case the flexible array does not occur last in the structure, which will help us prevent some kind of undefined behavior bugs from being inadvertently introduced[3] to the codebase from now on. Also, notice that, dynamic memory allocations won't be affected by this change: "Flexible array members have incomplete type, and so the sizeof operator may not be applied. As a quirk of the original implementation of zero-length arrays, sizeof evaluates to zero."[1] sizeof(flexible-array-member) triggers a warning because flexible array members have incomplete type[1]. There are some instances of code in which the sizeof operator is being incorrectly/erroneously applied to zero-length arrays and the result is zero. Such instances may be hiding some bugs. So, this work (flexible-array member conversions) will also help to get completely rid of those sorts of issues. This issue was found with the help of Coccinelle. [1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html [2] https://github.com/KSPP/linux/issues/21 [3] commit 76497732932f ("cxgb3/l2t: Fix undefined behaviour") Signed-off-by: Gustavo A. R. Silva --- drivers/net/wireless/ath/wcn36xx/hal.h | 4 ++-- drivers/net/wireless/ath/wcn36xx/testmode.h | 2 +- 2 files changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/net/wireless/ath/wcn36xx/hal.h b/drivers/net/wireless/ath/wcn36xx/hal.h index 6ba0fd57c951..aab5a58616fc 100644 --- a/drivers/net/wireless/ath/wcn36xx/hal.h +++ b/drivers/net/wireless/ath/wcn36xx/hal.h @@ -2240,7 +2240,7 @@ struct wcn36xx_hal_process_ptt_msg_req_msg { struct wcn36xx_hal_msg_header header; /* Actual FTM Command body */ - u8 ptt_msg[0]; + u8 ptt_msg[]; } __packed; struct wcn36xx_hal_process_ptt_msg_rsp_msg { @@ -2249,7 +2249,7 @@ struct wcn36xx_hal_process_ptt_msg_rsp_msg { /* FTM Command response status */ u32 ptt_msg_resp_status; /* Actual FTM Command body */ - u8 ptt_msg[0]; + u8 ptt_msg[]; } __packed; struct update_edca_params_req_msg { diff --git a/drivers/net/wireless/ath/wcn36xx/testmode.h b/drivers/net/wireless/ath/wcn36xx/testmode.h index 4c6cfdb46580..09d68fab9add 100644 --- a/drivers/net/wireless/ath/wcn36xx/testmode.h +++ b/drivers/net/wireless/ath/wcn36xx/testmode.h @@ -20,7 +20,7 @@ struct ftm_rsp_msg { u16 msg_id; u16 msg_body_length; u32 resp_status; - u8 msg_response[0]; + u8 msg_response[]; } __packed; /* The request buffer of FTM which contains a byte of command and the request */ -- 2.26.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel