From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 3115F24A06A; Mon, 13 Oct 2025 15:00:30 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760367630; cv=none; b=KQDcsTYLBLX0JVgETLsNTDc2nkA2vTS7Y43av0TjP9Ms16p29RBar+NsFVNki27gCaCUc4qr5gpqOxA1VHW2iVbUplsHV/A1sS2+YKCxMmL992YSE/KzW8LOJcSp8odEJjOkaBPCTX7PCIHkHeuXUV8v+HA1aousveX3UeLykgU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760367630; c=relaxed/simple; bh=qqKmCwLv+cvuT/Mk6evSTsJG5itwFLmt64tB9MDEcKs=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Ku+vcIlZ6pG2fnrIavRoQZ5ie4yqOq5uTfKiECYyB5DN8s1b/xMBkR2+1XHQCgc+mfAj7ySGmxKpdeIabWonxbHuqE2/ASFE2l8Enj9+t/U+IVgRBrmt5EZ7iONxGuIGR6zkmpQvrZ8sEhCkLmDQiju+NlSEJXM7q3b/BPh7F1c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=bIlHs5ET; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="bIlHs5ET" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B0328C4CEE7; Mon, 13 Oct 2025 15:00:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760367630; bh=qqKmCwLv+cvuT/Mk6evSTsJG5itwFLmt64tB9MDEcKs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=bIlHs5ETi3BCxN5QLmRY3xVzdX1e7Pj9bXEjRjAx19p6TUoPlPAifhqSdEF4zx0d9 mk/Zz07VZ8qz1hPWqxkm7vQ8stxfond3KWEHczFektqm8AA9HfDB31wcke8E+eXHDQ fCJvu/3iNz17xzhW97CEwUgAhvZuz62Sf0XOahNc= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Arnd Bergmann , Hans Verkuil , Sasha Levin Subject: [PATCH 6.6 079/196] media: st-delta: avoid excessive stack usage Date: Mon, 13 Oct 2025 16:44:30 +0200 Message-ID: <20251013144318.174574005@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013144315.184275491@linuxfoundation.org> References: <20251013144315.184275491@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Arnd Bergmann [ Upstream commit 5954ad7d1af92cb6244c5f31216e43af55febbb7 ] Building with a reduced stack warning limit shows that delta_mjpeg_decode() copies a giant structure to the stack each time but only uses three of its members: drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c: In function 'delta_mjpeg_decode': drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c:427:1: error: the frame size of 1296 bytes is larger than 1280 bytes [-Werror=frame-larger-than=] Open-code the passing of the structure members that are actually used here. Fixes: 433ff5b4a29b ("[media] st-delta: add mjpeg support") Signed-off-by: Arnd Bergmann Signed-off-by: Hans Verkuil Signed-off-by: Sasha Levin --- .../platform/st/sti/delta/delta-mjpeg-dec.c | 20 ++++++++++--------- 1 file changed, 11 insertions(+), 9 deletions(-) diff --git a/drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c b/drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c index 0533d4a083d24..a078f1107300e 100644 --- a/drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c +++ b/drivers/media/platform/st/sti/delta/delta-mjpeg-dec.c @@ -239,7 +239,7 @@ static int delta_mjpeg_ipc_open(struct delta_ctx *pctx) return 0; } -static int delta_mjpeg_ipc_decode(struct delta_ctx *pctx, struct delta_au *au) +static int delta_mjpeg_ipc_decode(struct delta_ctx *pctx, dma_addr_t pstart, dma_addr_t pend) { struct delta_dev *delta = pctx->dev; struct delta_mjpeg_ctx *ctx = to_ctx(pctx); @@ -256,8 +256,8 @@ static int delta_mjpeg_ipc_decode(struct delta_ctx *pctx, struct delta_au *au) memset(params, 0, sizeof(*params)); - params->picture_start_addr_p = (u32)(au->paddr); - params->picture_end_addr_p = (u32)(au->paddr + au->size - 1); + params->picture_start_addr_p = pstart; + params->picture_end_addr_p = pend; /* * !WARNING! @@ -374,12 +374,14 @@ static int delta_mjpeg_decode(struct delta_ctx *pctx, struct delta_au *pau) struct delta_dev *delta = pctx->dev; struct delta_mjpeg_ctx *ctx = to_ctx(pctx); int ret; - struct delta_au au = *pau; + void *au_vaddr = pau->vaddr; + dma_addr_t au_dma = pau->paddr; + size_t au_size = pau->size; unsigned int data_offset = 0; struct mjpeg_header *header = &ctx->header_struct; if (!ctx->header) { - ret = delta_mjpeg_read_header(pctx, au.vaddr, au.size, + ret = delta_mjpeg_read_header(pctx, au_vaddr, au_size, header, &data_offset); if (ret) { pctx->stream_errors++; @@ -405,17 +407,17 @@ static int delta_mjpeg_decode(struct delta_ctx *pctx, struct delta_au *pau) goto err; } - ret = delta_mjpeg_read_header(pctx, au.vaddr, au.size, + ret = delta_mjpeg_read_header(pctx, au_vaddr, au_size, ctx->header, &data_offset); if (ret) { pctx->stream_errors++; goto err; } - au.paddr += data_offset; - au.vaddr += data_offset; + au_dma += data_offset; + au_vaddr += data_offset; - ret = delta_mjpeg_ipc_decode(pctx, &au); + ret = delta_mjpeg_ipc_decode(pctx, au_dma, au_dma + au_size - 1); if (ret) goto err; -- 2.51.0