Commit f13613ac authored by Mauro Carvalho Chehab's avatar Mauro Carvalho Chehab

V4L/DVB (7235): tuner-simple: fix a buffer overflow

simple_set_tv() creates a buffer with 4 elements, and calls
simple_std_setup(), passing &buffer[1]. This makes the 5th element of buffer to
be initialized to 0, overriding some area outside the buffer.

Also, simple_std_setup() receives a buffer as parameter, but the buffer is
just overriden after the call, so, it doesn't make much sense to pass it as a
parameter.

This patch removes buffer[] from the function call, creating, instead, a local
var to be used internally.

Thanks to Axel Rometsch <axel.rometsch@freenet.de> for pointing the issue.
Reviewed-by: default avatarMichael Krufky <mkrufky@linuxtv.org>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 6a6179b6
......@@ -251,7 +251,7 @@ static int simple_config_lookup(struct dvb_frontend *fe,
static int simple_std_setup(struct dvb_frontend *fe,
struct analog_parameters *params,
u8 *buffer, u8 *config, u8 *cb)
u8 *config, u8 *cb)
{
struct tuner_simple_priv *priv = fe->tuner_priv;
u8 tuneraddr;
......@@ -323,14 +323,12 @@ static int simple_std_setup(struct dvb_frontend *fe,
break;
case TUNER_PHILIPS_TUV1236D:
{
/* 0x40 -> ATSC antenna input 1 */
/* 0x48 -> ATSC antenna input 2 */
/* 0x00 -> NTSC antenna input 1 */
/* 0x08 -> NTSC antenna input 2 */
buffer[0] = 0x14;
buffer[1] = 0x00;
buffer[2] = 0x17;
buffer[3] = 0x00;
u8 buffer[4] = { 0x14, 0x00, 0x17, 0x00};
*cb &= ~0x40;
if (params->std & V4L2_STD_ATSC) {
*cb |= 0x40;
......@@ -351,6 +349,7 @@ static int simple_std_setup(struct dvb_frontend *fe,
/* FIXME: input */
break;
}
}
return 0;
}
......@@ -509,7 +508,7 @@ static int simple_set_tv_freq(struct dvb_frontend *fe,
offset / 16, offset % 16 * 100 / 16, div);
/* tv norm specific stuff for multi-norm tuners */
simple_std_setup(fe, params, &buffer[1], &config, &cb);
simple_std_setup(fe, params, &config, &cb);
if (t_params->cb_first_if_lower_freq && div < priv->last_div) {
buffer[0] = config;
......
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