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media: dvb_vb2: limit reqbufs size to a sane value

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

So, add an upper limit.

Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
This commit is contained in:
Mauro Carvalho Chehab 2017-12-28 07:11:40 -05:00
parent 7b6c96d59e
commit 2c06aa7c31
1 changed files with 8 additions and 0 deletions
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8
drivers/media/dvb-core/dvb_vb2.c
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@ -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);