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([128.93.90.48]) by mail2-relais-roc.national.inria.fr with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 27 Jun 2023 16:43:52 +0200 From: Julia Lawall To: Manivannan Sadhasivam Cc: kernel-janitors@vger.kernel.org, keescook@chromium.org, christophe.jaillet@wanadoo.fr, kuba@kernel.org, mhi@lists.linux.dev, linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 10/24] bus: mhi: host: use vmalloc_array and vcalloc Date: Tue, 27 Jun 2023 16:43:25 +0200 Message-Id: <20230627144339.144478-11-Julia.Lawall@inria.fr> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20230627144339.144478-1-Julia.Lawall@inria.fr> References: <20230627144339.144478-1-Julia.Lawall@inria.fr> MIME-Version: 1.0 X-Spam-Status: No, score=-4.4 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,DKIM_VALID_EF,RCVD_IN_DNSWL_MED,SPF_HELO_NONE, SPF_PASS,T_SCC_BODY_TEXT_LINE,URIBL_BLOCKED autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1769868496362858816?= X-GMAIL-MSGID: =?utf-8?q?1769868496362858816?= Use vmalloc_array and vcalloc to protect against multiplication overflows. The changes were done using the following Coccinelle semantic patch: // @initialize:ocaml@ @@ let rename alloc = match alloc with "vmalloc" -> "vmalloc_array" | "vzalloc" -> "vcalloc" | _ -> failwith "unknown" @@ size_t e1,e2; constant C1, C2; expression E1, E2, COUNT, x1, x2, x3; typedef u8; typedef __u8; type t = {u8,__u8,char,unsigned char}; identifier alloc = {vmalloc,vzalloc}; fresh identifier realloc = script:ocaml(alloc) { rename alloc }; @@ ( alloc(x1*x2*x3) | alloc(C1 * C2) | alloc((sizeof(t)) * (COUNT), ...) | - alloc((e1) * (e2)) + realloc(e1, e2) | - alloc((e1) * (COUNT)) + realloc(COUNT, e1) | - alloc((E1) * (E2)) + realloc(E1, E2) ) // Signed-off-by: Julia Lawall Reviewed-by: Jeffrey Hugo --- v2: Use vmalloc_array and vcalloc instead of array_size. This also leaves a multiplication of a constant by a sizeof as is. Two patches are thus dropped from the series. drivers/bus/mhi/host/init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -u -p a/drivers/bus/mhi/host/init.c b/drivers/bus/mhi/host/init.c --- a/drivers/bus/mhi/host/init.c +++ b/drivers/bus/mhi/host/init.c @@ -759,7 +759,7 @@ static int parse_ch_cfg(struct mhi_contr * so to avoid any memory possible allocation failures, vzalloc is * used here */ - mhi_cntrl->mhi_chan = vzalloc(mhi_cntrl->max_chan * + mhi_cntrl->mhi_chan = vcalloc(mhi_cntrl->max_chan, sizeof(*mhi_cntrl->mhi_chan)); if (!mhi_cntrl->mhi_chan) return -ENOMEM;