From nobody Sun Apr 5 13:06:18 2026 Received: from cstnet.cn (smtp21.cstnet.cn [159.226.251.21]) (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 DD3E1362143; Tue, 24 Mar 2026 08:09:11 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=159.226.251.21 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774339758; cv=none; b=aKRLCC37k1QrExuHhXTSHFB7hfPdvTfzFO2+sD5o7wEYzwxxAM43CeB2SvkYUx7Nak9I1rYQ684QKYZDpS5XWGFH95fdRK6aCKzgUIFKUp66JuDzUEvQoWGG5EJbfd2CttBGkYU4DOOToKeGEcf3E55pqdumM4ZCtkPZ2JAgriI= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1774339758; c=relaxed/simple; bh=cqH5rURx3Dp+FJG2C8XwFT90pQsy89+ITQTIFqIQwEE=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=o4qwrhryIJtyuIlok3lJysZAe/MfYqI0/JdZ9gw3S43crqXyx6h53Y52Gv7P3LuLt173KEp3Fbf284EwJ7jstZHXFDfsJi9TvEWJHvgUTclb4tZcI0DApqy3MjDlZ8OR92XopSrr8IY/wCdwbvHiNuxqPd+P+I/QorTxkyZvj/g= 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=159.226.251.21 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-01 (Coremail) with SMTP id qwCowADnj2uYRsJpr877Cg--.1755S2; Tue, 24 Mar 2026 16:08:56 +0800 (CST) From: Pengpeng Hou To: mripard@kernel.org Cc: paulk@sys-base.io, mchehab@kernel.org, gregkh@linuxfoundation.org, wens@kernel.org, jernej.skrabec@gmail.com, samuel@sholland.org, nicolas.dufresne@collabora.com, 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: skip invalid H.264 reference list entries Date: Tue, 24 Mar 2026 16:08:56 +0800 Message-ID: <20260324080856.56787-1-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: qwCowADnj2uYRsJpr877Cg--.1755S2 X-Coremail-Antispam: 1UD129KBjvJXoW7tFWrZF43AFyUGw4xtFWxtFb_yoW8Gry5pF 4jgw12ya1DJF45GF47AF40vFyYgas5ZrWfCry5K3WxZF15uF1xuFnY9348Xrs8Za98C3ya yF1ag345Xa1DA37anT9S1TB71UUUUU7qnTZGkaVYY2UrUUUUjbIjqfuFe4nvWSU5nxnvy2 9KBjDU0xBIdaVrnRJUUU9Y14x267AKxVW8JVW5JwAFc2x0x2IEx4CE42xK8VAvwI8IcIk0 rVWrJVCq3wAFIxvE14AKwVWUJVWUGwA2ocxC64kIII0Yj41l84x0c7CEw4AK67xGY2AK02 1l84ACjcxK6xIIjxv20xvE14v26ryj6F1UM28EF7xvwVC0I7IYx2IY6xkF7I0E14v26r4U JVWxJr1l84ACjcxK6I8E87Iv67AKxVW0oVCq3wA2z4x0Y4vEx4A2jsIEc7CjxVAFwI0_Gc CE3s1le2I262IYc4CY6c8Ij28IcVAaY2xG8wAqx4xG64xvF2IEw4CE5I8CrVC2j2WlYx0E 2Ix0cI8IcVAFwI0_JrI_JrylYx0Ex4A2jsIE14v26r4j6F4UMcvjeVCFs4IE7xkEbVWUJV W8JwACjcxG0xvY0x0EwIxGrwACjI8F5VA0II8E6IAqYI8I648v4I1lFIxGxcIEc7CjxVA2 Y2ka0xkIwI1lc7CjxVAaw2AFwI0_Jw0_GFyl42xK82IYc2Ij64vIr41l4I8I3I0E4IkC6x 0Yz7v_Jr0_Gr1lx2IqxVAqx4xG67AKxVWUJVWUGwC20s026x8GjcxK67AKxVWUGVWUWwC2 zVAF1VAY17CE14v26r1q6r43MIIYrxkI7VAKI48JMIIF0xvE2Ix0cI8IcVAFwI0_Jr0_JF 4lIxAIcVC0I7IYx2IY6xkF7I0E14v26r4j6F4UMIIF0xvE42xK8VAvwI8IcIk0rVWUJVWU CwCI42IY6I8E87Iv67AKxVW8JVWxJwCI42IY6I8E87Iv6xkF7I0E14v26r4j6r4UJbIYCT nIWIevJa73UjIFyTuYvjfUOlkVUUUUU X-CM-SenderInfo: pshqw1xhqjqxpvfd2hldfou0/ Content-Type: text/plain; charset="utf-8" Cedrus consumes H.264 ref_pic_list0/ref_pic_list1 entries from the stateless slice control and later uses their indices to look up decode->dpb[] in _cedrus_write_ref_list(). Rejecting such controls in cedrus_try_ctrl() would break existing userspace, since stateless H.264 reference lists may legitimately carry out-of-range indices for missing references. Instead, guard the actual DPB lookup in Cedrus and skip entries whose indices do not fit the fixed V4L2_H264_NUM_DPB_ENTRIES array. This keeps the fix local to the driver use site and avoids out-of-bounds reads from malformed or unsupported reference list entries. Signed-off-by: Pengpeng Hou Acked-by: Jernej Skrabec Tested-by: Chen-Yu Tsai --- drivers/staging/media/sunxi/cedrus/cedrus_h264.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c b/drivers/sta= ging/media/sunxi/cedrus/cedrus_h264.c --- a/drivers/staging/media/sunxi/cedrus/cedrus_h264.c +++ b/drivers/staging/media/sunxi/cedrus/cedrus_h264.c @@ -210,6 +210,9 @@ static void _cedrus_write_ref_list(struct cedrus_ctx *c= tx, u8 dpb_idx; =20 dpb_idx =3D ref_list[i].index; + if (dpb_idx >=3D V4L2_H264_NUM_DPB_ENTRIES) + continue; + dpb =3D &decode->dpb[dpb_idx]; =20 if (!(dpb->flags & V4L2_H264_DPB_ENTRY_FLAG_ACTIVE)) --=20 2.50.1