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Fri, 17 Jul 2026 02:12:35 -0700 (PDT) Date: Fri, 17 Jul 2026 12:12:29 +0300 From: Dan Carpenter To: Alain Volmat Cc: Hugues Fruchet , Mauro Carvalho Chehab , Maxime Coquelin , Alexandre Torgue , Sakari Ailus , linux-media@vger.kernel.org, linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kernel-janitors@vger.kernel.org Subject: [PATCH] media: stm32: dcmi: fix some error handling bugs in probe() Message-ID: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline X-Mailer: git-send-email haha only kidding There are a few issues here: 1) After we assign: chan = dma_request_chan(&pdev->dev, "tx"); Then the error paths need to clean up before returning. The first error path does a direct return. 2) The error paths check "dcmi->mdma_chan" but that is not assigned until later so it results in memory leaks. Test "mdma_chan" instead. 3) The error handling calls dma_release_channel(dcmi->dma_chan) before "dcmi->dma_chan" has been assigned which leads to a NULL pointer dereference. Use the "chan" variable instead. I also moved the call to dma_release_channel() after the call to dma_release_channel() so it mirrors the allocation code better. Fixes: bc901885fae0 ("media: stm32: dcmi: perform dmaengine_slave_config at probe") Signed-off-by: Dan Carpenter --- >From static analysis. Untested. drivers/media/platform/st/stm32/stm32-dcmi.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/drivers/media/platform/st/stm32/stm32-dcmi.c b/drivers/media/platform/st/stm32/stm32-dcmi.c index eeb0199864dd..c9f08b2465be 100644 --- a/drivers/media/platform/st/stm32/stm32-dcmi.c +++ b/drivers/media/platform/st/stm32/stm32-dcmi.c @@ -2024,8 +2024,10 @@ static int dcmi_probe(struct platform_device *pdev) mdma_chan = dma_request_chan(&pdev->dev, "mdma_tx"); if (IS_ERR(mdma_chan)) { ret = PTR_ERR(mdma_chan); - if (ret != -ENODEV) - return dev_err_probe(&pdev->dev, ret, "Failed to request MDMA channel\n"); + if (ret != -ENODEV) { + dev_err_probe(&pdev->dev, ret, "Failed to request MDMA channel\n"); + goto err_release_chan; + } mdma_chan = NULL; } @@ -2206,12 +2208,13 @@ static int dcmi_probe(struct platform_device *pdev) err_media_device_cleanup: media_device_cleanup(&dcmi->mdev); err_mdma_slave_config: - if (dcmi->mdma_chan) + if (mdma_chan) gen_pool_free(dcmi->sram_pool, (unsigned long)dcmi->sram_buf, dcmi->sram_buf_size); err_dma_slave_config: - dma_release_channel(dcmi->dma_chan); - if (dcmi->mdma_chan) + if (mdma_chan) dma_release_channel(mdma_chan); +err_release_chan: + dma_release_channel(chan); return ret; } -- 2.53.0