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 A626530AD0A; Mon, 13 Oct 2025 15:32:06 +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=1760369526; cv=none; b=bhE3BUcFQwdfrFUL+S8Q65MyZRXmid/OFUjlmvqvgO0WGaiccTdoWfr6bsV+u+JnAoD+aaYxe69TD54ZBufgAlqtxNVCeMGgKi7v3ehgx2+e/KRBvzb7Bmyx1kYc9cg0wd49FlzZbWTPK1r1Qy83OdT1rOB39ozYrHHf8rH2TNY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760369526; c=relaxed/simple; bh=H+jHcfjguSScUxMImuQcwgth0HfB5HRgR3Oe/pVJJm0=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=M/un3T3Tjwnjdna7ovN4CUOZRhV5S+07mlDxHQBy16unR5IBDZ00yPEIenQded+PCUbbgaz5lWtK7PmUvhM1u3XKOdmAMPkk3+UNkQZzelhZYXKzOToKAxvK/mw6tC4QamE5Uv7akUjJY+KShUmT5FNJoQLO8eWSh1/WAvhN1Aw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=qDJc0Ezo; 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="qDJc0Ezo" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 30DC2C4CEE7; Mon, 13 Oct 2025 15:32:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1760369526; bh=H+jHcfjguSScUxMImuQcwgth0HfB5HRgR3Oe/pVJJm0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=qDJc0EzoSniCPwIOCfkH3fONH3MSit0QQiUY3ZfCD9YZlRnpp/RfCJKMjTXvHi1og Buj60AN2PYKE/jXubuqEjF7fmsJZEQ7Ve7q7nW4L0fRM9W09wYt6tXEg7R7fcQD9mI vRs6KKA9bhsx16EmFHyn2scPSFHbOPPMUf7ao2Ps= 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 6.17 278/563] media: st-delta: avoid excessive stack usage Date: Mon, 13 Oct 2025 16:42:19 +0200 Message-ID: <20251013144421.343069931@linuxfoundation.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20251013144411.274874080@linuxfoundation.org> References: <20251013144411.274874080@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 6.17-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