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R. Silva" In-Reply-To: <20230817235859.49846-13-keescook@chromium.org> X-AntiAbuse: This header was added to track abuse, please include it with any abuse report X-AntiAbuse: Primary Hostname - gator4166.hostgator.com X-AntiAbuse: Original Domain - lists.infradead.org X-AntiAbuse: Originator/Caller UID/GID - [47 12] / [47 12] X-AntiAbuse: Sender Address Domain - embeddedor.com X-BWhitelist: no X-Source-IP: 187.162.21.192 X-Source-L: No X-Exim-ID: 1qWoEB-000XeZ-0x X-Source: X-Source-Args: X-Source-Dir: X-Source-Sender: 187-162-21-192.static.axtel.net ([192.168.15.8]) [187.162.21.192]:42946 X-Source-Auth: gustavo@embeddedor.com X-Email-Count: 456 X-Org: HG=hgshared;ORG=hostgator; X-Source-Cap: Z3V6aWRpbmU7Z3V6aWRpbmU7Z2F0b3I0MTY2Lmhvc3RnYXRvci5jb20= X-Local-Domain: yes X-CMAE-Envelope: MS4xfCKwwTRDbGNcOjIrXKEKg5AIT3B0VSD/R0YsszkyuCKcOb3xvS9pvfvt6w0wElXKfYXNQEVB6B9EjaRNMp8LvxVpmxZTRVJmNSwZvMUOt7js/XKPpfzA FRBiF7UhTvGNccvg4kLSXehJNtj4Llwn3qoMVvgUu+B8I/b/7wTgopIkoWU8j06EV/L7n2jnXnC+g/IpuWQyC5tHlhvQO/B5g+d5mR9dR06e1xssNupt3OQg X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230817_182445_459260_46579D07 X-CRM114-Status: GOOD ( 15.38 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 8/17/23 17:58, Kees Cook wrote: > Prepare for the coming implementation by GCC and Clang of the __counted_by > attribute. Flexible array members annotated with __counted_by can have > their accesses bounds-checked at run-time checking via CONFIG_UBSAN_BOUNDS > (for array indexing) and CONFIG_FORTIFY_SOURCE (for strcpy/memcpy-family > functions). > > As found with Coccinelle[1], add __counted_by for struct stm32_mdma_desc. > Additionally, since the element count member must be set before accessing > the annotated flexible array member, move its initialization earlier. > > [1] https://github.com/kees/kernel-tools/blob/trunk/coccinelle/examples/counted_by.cocci > > Cc: Vinod Koul > Cc: Maxime Coquelin > Cc: Alexandre Torgue > Cc: dmaengine@vger.kernel.org > Cc: linux-stm32@st-md-mailman.stormreply.com > Cc: linux-arm-kernel@lists.infradead.org > Signed-off-by: Kees Cook Reviewed-by: Gustavo A. R. Silva Thanks -- Gustavo > --- > drivers/dma/stm32-mdma.c | 5 ++--- > 1 file changed, 2 insertions(+), 3 deletions(-) > > diff --git a/drivers/dma/stm32-mdma.c b/drivers/dma/stm32-mdma.c > index 0de234022c6d..926d6ecf1274 100644 > --- a/drivers/dma/stm32-mdma.c > +++ b/drivers/dma/stm32-mdma.c > @@ -224,7 +224,7 @@ struct stm32_mdma_desc { > u32 ccr; > bool cyclic; > u32 count; > - struct stm32_mdma_desc_node node[]; > + struct stm32_mdma_desc_node node[] __counted_by(count); > }; > > struct stm32_mdma_dma_config { > @@ -321,6 +321,7 @@ static struct stm32_mdma_desc *stm32_mdma_alloc_desc( > desc = kzalloc(struct_size(desc, node, count), GFP_NOWAIT); > if (!desc) > return NULL; > + desc->count = count; > > for (i = 0; i < count; i++) { > desc->node[i].hwdesc = > @@ -330,8 +331,6 @@ static struct stm32_mdma_desc *stm32_mdma_alloc_desc( > goto err; > } > > - desc->count = count; > - > return desc; > > err: _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel