From nobody Sun Apr 5 16:31:34 2026 Received: from cstnet.cn (smtp25.cstnet.cn [159.226.251.25]) (using TLSv1.2 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 97AD137B010; Tue, 24 Mar 2026 02:05:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.25 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774317909; cv=none; b=NlqiA/4KVCLWKKNrwP7vQG3ulNaLFKag/D0LNzs0yGurpnOGVe1keNb2kMH/EvdX6BpHNAahrJBshRhNEH5AqF0yDLHJjRG83ssR1Bh1s9Yshs4lzmRv3JG3Aj21BREefN6Quibw+Y6K8zOBEmiYQYpsQ8+vhOIDLiSRRbwkdmg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774317909; c=relaxed/simple; bh=DAwIrXebhENqL23L45uimbqY/43wBEmFqnRddH3bpLg=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=bv+mc6Yp65nfVCeGWVAT3VFddpzAyarV6YIU4cRBsJ/q6PBS0tqO1FLpHgG8B0Z/bUp7768LDTVq38gcqpH7aLY5jQOM0KrDU+cjBOeCaf5nro5coISAuwRT4eV+99XaLhUejK0a8oMPlcve+0vdQURspBXK4sa0T3p9SqxAT8U= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn; spf=pass smtp.mailfrom=iscas.ac.cn; arc=none smtp.client-ip=159.226.251.25 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=iscas.ac.cn Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=iscas.ac.cn Received: from localhost.localdomain (unknown [111.196.245.197]) by APP-05 (Coremail) with SMTP id zQCowAAXrA8v8cFpkBFKCw--.34865S2; Tue, 24 Mar 2026 10:04:54 +0800 (CST) From: Pengpeng Hou To: Maxime Ripard , Paul Kocialkowski , Mauro Carvalho Chehab , Greg Kroah-Hartman , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland Cc: linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-kernel@vger.kernel.org, pengpeng@iscas.ac.cn Subject: [PATCH] media: cedrus: validate H.264 reference list indices Date: Tue, 24 Mar 2026 10:04:31 +0800 Message-ID: <20260324020431.1800-1-pengpeng@iscas.ac.cn> X-Mailer: git-send-email 2.50.1 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 X-CM-TRANSID: zQCowAAXrA8v8cFpkBFKCw--.34865S2 X-Coremail-Antispam: 1UD129KBjvJXoW7KF48WFykJr4fGrW3ZFyDGFg_yoW8tFyxpF 45Cr13ZayUXF43KF43Zr4kXa4a9as3AFsxKrWag3W3X3W3GFy7Xr4rKw1UZrn8Aa15C3ya yrn5J3yUKFyUAaDanT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9Y14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUGVWUXwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4j 6F4UM28EF7xvwVC2z280aVAFwI0_Cr1j6rxdM28EF7xvwVC2z280aVCY1x0267AKxVWxJr 0_GcWle2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_JrI_JrylYx0Ex4A2jsIE14v26r1j6r4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1lc7CjxVAaw2AFwI0_Jw0_GFyl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x 0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2 zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF 4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWU CwCI42IY6I8E87Iv67AKxVWUJVW8JwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCT nIWIevJa73UjIFyTuYvjfUO9N3UUUUU X-CM-SenderInfo: pshqw1xhqjqxpvfd2hldfou0/ Content-Type: text/plain; charset="utf-8" Cedrus validates HEVC slice reference lists in cedrus_try_ctrl(), but the H.264 path still consumes ref_pic_list0/ref_pic_list1 indices straight from the stateless slice control. Those indices are later used to index the fixed-size decode_params->dpb[] array in _cedrus_write_ref_list(). Reject H.264 slice controls whose active reference counts or reference indices exceed V4L2_H264_NUM_DPB_ENTRIES before the driver reaches the DPB lookup. This keeps the validation next to the existing Cedrus stateless control checks and avoids driver-specific out-of-bounds reads from malformed userspace control payloads. Signed-off-by: Pengpeng Hou --- drivers/staging/media/sunxi/cedrus/cedrus.c | 23 +++++++++++++++++++++ 1 file changed, 23 insertions(+) diff --git a/drivers/staging/media/sunxi/cedrus/cedrus.c b/drivers/staging/= media/sunxi/cedrus/cedrus.c index d68da1eaa7aa..905084c097a9 100644 --- a/drivers/staging/media/sunxi/cedrus/cedrus.c +++ b/drivers/staging/media/sunxi/cedrus/cedrus.c @@ -42,6 +42,29 @@ static int cedrus_try_ctrl(struct v4l2_ctrl *ctrl) if (sps->bit_depth_luma_minus8 !=3D 0) /* Only 8-bit is supported */ return -EINVAL; + } else if (ctrl->id =3D=3D V4L2_CID_STATELESS_H264_SLICE_PARAMS) { + const struct v4l2_ctrl_h264_slice_params *slice =3D ctrl->p_new.p_h264_s= lice_params; + unsigned int i; + + if (slice->num_ref_idx_l0_active_minus1 >=3D + V4L2_H264_NUM_DPB_ENTRIES) + return -EINVAL; + + for (i =3D 0; i <=3D slice->num_ref_idx_l0_active_minus1; i++) + if (slice->ref_pic_list0[i].index >=3D + V4L2_H264_NUM_DPB_ENTRIES) + return -EINVAL; + + if (slice->slice_type =3D=3D V4L2_H264_SLICE_TYPE_B) { + if (slice->num_ref_idx_l1_active_minus1 >=3D + V4L2_H264_NUM_DPB_ENTRIES) + return -EINVAL; + + for (i =3D 0; i <=3D slice->num_ref_idx_l1_active_minus1; i++) + if (slice->ref_pic_list1[i].index >=3D + V4L2_H264_NUM_DPB_ENTRIES) + return -EINVAL; + } } else if (ctrl->id =3D=3D V4L2_CID_STATELESS_HEVC_SPS) { const struct v4l2_ctrl_hevc_sps *sps =3D ctrl->p_new.p_hevc_sps; struct cedrus_ctx *ctx =3D container_of(ctrl->handler, struct cedrus_ctx= , hdl); --=20 2.50.1 (Apple Git-155)