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Commit 2c06aa7c authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab
Browse files

media: dvb_vb2: limit reqbufs size to a sane value 



It is not a good idea to let users to request a very high buffer
size.

So, add an upper limit.

Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@s-opensource.com>
parent 7b6c96d5

drivers/media/dvb-core/dvb_vb2.c

+8 −0
Original line number Diff line number Diff line
@@ -18,6 +18,8 @@ 
#include "dvbdev.h"

#include "dvb_vb2.h"



#define DVB_V2_MAX_SIZE		(4096 * 188)



static int vb2_debug;

module_param(vb2_debug, int, 0644);
@@ -330,6 +332,12 @@ int dvb_vb2_reqbufs(struct dvb_vb2_ctx *ctx, struct dmx_requestbuffers *req) 
{

	int ret;



	/* Adjust size to a sane value */

	if (req->size > DVB_V2_MAX_SIZE)

		req->size = DVB_V2_MAX_SIZE;



	/* FIXME: round req->size to a 188 or 204 multiple */



	ctx->buf_siz = req->size;

	ctx->buf_cnt = req->count;

	ret = vb2_core_reqbufs(&ctx->vb_q, VB2_MEMORY_MMAP, &req->count);