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Sun, 31 May 2026 14:08:05 -0700 (PDT) Received: from ryzen ([2601:644:8000:5b5d:7285:c2ff:fe45:8a32]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-84232ef8172sm4857400b3a.12.2026.05.31.14.08.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 31 May 2026 14:08:05 -0700 (PDT) From: Rosen Penev To: dmaengine@vger.kernel.org Cc: Linus Walleij , Vinod Koul , Frank Li , Lee Jones , Arnd Bergmann , linux-arm-kernel@lists.infradead.org (moderated list:ARM/NOMADIK/Ux500 ARCHITECTURES), linux-kernel@vger.kernel.org (open list) Subject: [PATCH] dmaengine: ste_dma40: fix out-of-bounds access from D40_MEMCPY_MAX_CHANS Date: Sun, 31 May 2026 14:07:47 -0700 Message-ID: <20260531210747.11401-1-rosenp@gmail.com> X-Mailer: git-send-email 2.54.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" D40_MEMCPY_MAX_CHANS is defined as 8, but the dma40_memcpy_channels[] array only has 6 elements. This mismatch causes an out-of-bounds issue: 1. d40_of_probe() accepts up to 8 memcpy channels from DT (num_memcpy > D40_MEMCPY_MAX_CHANS allows 7-8), then writes them into the 6-element dma40_memcpy_channels[], corrupting adjacent stack memory. Fix by defining D40_MEMCPY_MAX_CHANS as 6 to match the array size. Fixes: a7dacb68b35a ("dmaengine: ste_dma40: Allow memcpy channels to be con= figured from DT") Assisted-by: Opencode:Big-Pickle Signed-off-by: Rosen Penev Reviewed-by: Linus Walleij --- drivers/dma/ste_dma40.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c index 0d9ffa3e2663..c45643b7f415 100644 --- a/drivers/dma/ste_dma40.c +++ b/drivers/dma/ste_dma40.c @@ -86,7 +86,7 @@ struct stedma40_platform_data { #define D40_ALLOC_PHY BIT(30) #define D40_ALLOC_LOG_FREE 0 =20 -#define D40_MEMCPY_MAX_CHANS 8 +#define D40_MEMCPY_MAX_CHANS 6 =20 /* Reserved event lines for memcpy only. */ #define DB8500_DMA_MEMCPY_EV_0 51 --=20 2.54.0