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authorSean Young <sean@mess.org>2018-01-05 08:26:51 -0500
committerMauro Carvalho Chehab <mchehab@s-opensource.com>2018-01-23 07:26:50 -0500
commitddf9c1bb3d2ae24a216237d8195bb31ff632d8e5 (patch)
treeba9dcf0d8b1e87c6e3f67c4e4f5af6c2798e7993 /drivers/media
parente3cd973429ff7d05480b3889a9a6f4b658083137 (diff)
media: rc: clean up leader pulse/space for manchester encoding
The IR rc6 encoder sends the header using manchester encoding using 0 bits, which causes the following: UBSAN: Undefined behaviour in drivers/media/rc/rc-ir-raw.c:247:6 shift exponent 4294967295 is too large for 64-bit type 'long long unsigned int' So, allow the leader code to send a pulse and space and remove the unused pulse_space_start field. Cc: Antti Seppälä <a.seppala@gmail.com> Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/rc/ir-mce_kbd-decoder.c2
-rw-r--r--drivers/media/rc/ir-rc5-decoder.c9
-rw-r--r--drivers/media/rc/ir-rc6-decoder.c35
-rw-r--r--drivers/media/rc/rc-core-priv.h10
-rw-r--r--drivers/media/rc/rc-ir-raw.c12
5 files changed, 24 insertions, 44 deletions
diff --git a/drivers/media/rc/ir-mce_kbd-decoder.c b/drivers/media/rc/ir-mce_kbd-decoder.c
index 8cf4cf358052..2a279b3b9c0a 100644
--- a/drivers/media/rc/ir-mce_kbd-decoder.c
+++ b/drivers/media/rc/ir-mce_kbd-decoder.c
@@ -424,7 +424,7 @@ static int ir_mce_kbd_unregister(struct rc_dev *dev)
}
static const struct ir_raw_timings_manchester ir_mce_kbd_timings = {
- .leader = MCIR2_PREFIX_PULSE,
+ .leader_pulse = MCIR2_PREFIX_PULSE,
.invert = 1,
.clock = MCIR2_UNIT,
.trailer_space = MCIR2_UNIT * 10,
diff --git a/drivers/media/rc/ir-rc5-decoder.c b/drivers/media/rc/ir-rc5-decoder.c
index f589d99245eb..a1d6c955ffc8 100644
--- a/drivers/media/rc/ir-rc5-decoder.c
+++ b/drivers/media/rc/ir-rc5-decoder.c
@@ -173,16 +173,14 @@ out:
}
static const struct ir_raw_timings_manchester ir_rc5_timings = {
- .leader = RC5_UNIT,
- .pulse_space_start = 0,
+ .leader_pulse = RC5_UNIT,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};
static const struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
{
- .leader = RC5_UNIT,
- .pulse_space_start = 0,
+ .leader_pulse = RC5_UNIT,
.clock = RC5_UNIT,
.trailer_space = RC5X_SPACE,
},
@@ -193,8 +191,7 @@ static const struct ir_raw_timings_manchester ir_rc5x_timings[2] = {
};
static const struct ir_raw_timings_manchester ir_rc5_sz_timings = {
- .leader = RC5_UNIT,
- .pulse_space_start = 0,
+ .leader_pulse = RC5_UNIT,
.clock = RC5_UNIT,
.trailer_space = RC5_UNIT * 10,
};
diff --git a/drivers/media/rc/ir-rc6-decoder.c b/drivers/media/rc/ir-rc6-decoder.c
index 665025303c28..422dec08738c 100644
--- a/drivers/media/rc/ir-rc6-decoder.c
+++ b/drivers/media/rc/ir-rc6-decoder.c
@@ -288,13 +288,8 @@ out:
static const struct ir_raw_timings_manchester ir_rc6_timings[4] = {
{
- .leader = RC6_PREFIX_PULSE,
- .pulse_space_start = 0,
- .clock = RC6_UNIT,
- .invert = 1,
- .trailer_space = RC6_PREFIX_SPACE,
- },
- {
+ .leader_pulse = RC6_PREFIX_PULSE,
+ .leader_space = RC6_PREFIX_SPACE,
.clock = RC6_UNIT,
.invert = 1,
},
@@ -329,27 +324,22 @@ static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
struct ir_raw_event *e = events;
if (protocol == RC_PROTO_RC6_0) {
- /* Modulate the preamble */
- ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);
- if (ret < 0)
- return ret;
-
/* Modulate the header (Start Bit & Mode-0) */
ret = ir_raw_gen_manchester(&e, max - (e - events),
- &ir_rc6_timings[1],
- RC6_HEADER_NBITS, (1 << 3));
+ &ir_rc6_timings[0],
+ RC6_HEADER_NBITS + 1, (1 << 3));
if (ret < 0)
return ret;
/* Modulate Trailer Bit */
ret = ir_raw_gen_manchester(&e, max - (e - events),
- &ir_rc6_timings[2], 1, 0);
+ &ir_rc6_timings[1], 1, 0);
if (ret < 0)
return ret;
/* Modulate rest of the data */
ret = ir_raw_gen_manchester(&e, max - (e - events),
- &ir_rc6_timings[3], RC6_0_NBITS,
+ &ir_rc6_timings[2], RC6_0_NBITS,
scancode);
if (ret < 0)
return ret;
@@ -372,27 +362,22 @@ static int ir_rc6_encode(enum rc_proto protocol, u32 scancode,
return -EINVAL;
}
- /* Modulate the preamble */
- ret = ir_raw_gen_manchester(&e, max, &ir_rc6_timings[0], 0, 0);
- if (ret < 0)
- return ret;
-
/* Modulate the header (Start Bit & Header-version 6 */
ret = ir_raw_gen_manchester(&e, max - (e - events),
- &ir_rc6_timings[1],
- RC6_HEADER_NBITS, (1 << 3 | 6));
+ &ir_rc6_timings[0],
+ RC6_HEADER_NBITS + 1, (1 << 3 | 6));
if (ret < 0)
return ret;
/* Modulate Trailer Bit */
ret = ir_raw_gen_manchester(&e, max - (e - events),
- &ir_rc6_timings[2], 1, 0);
+ &ir_rc6_timings[1], 1, 0);
if (ret < 0)
return ret;
/* Modulate rest of the data */
ret = ir_raw_gen_manchester(&e, max - (e - events),
- &ir_rc6_timings[3],
+ &ir_rc6_timings[2],
bits,
scancode);
if (ret < 0)
diff --git a/drivers/media/rc/rc-core-priv.h b/drivers/media/rc/rc-core-priv.h
index 3c3d2620f0e8..458e9eb2d6a9 100644
--- a/drivers/media/rc/rc-core-priv.h
+++ b/drivers/media/rc/rc-core-priv.h
@@ -166,17 +166,17 @@ static inline void init_ir_raw_event_duration(struct ir_raw_event *ev,
/**
* struct ir_raw_timings_manchester - Manchester coding timings
- * @leader: duration of leader pulse (if any) 0 if continuing
- * existing signal (see @pulse_space_start)
- * @pulse_space_start: 1 for starting with pulse (0 for starting with space)
+ * @leader_pulse: duration of leader pulse (if any) 0 if continuing
+ * existing signal
+ * @leader_space: duration of leader space (if any)
* @clock: duration of each pulse/space in ns
* @invert: if set clock logic is inverted
* (0 = space + pulse, 1 = pulse + space)
* @trailer_space: duration of trailer space in ns
*/
struct ir_raw_timings_manchester {
- unsigned int leader;
- unsigned int pulse_space_start:1;
+ unsigned int leader_pulse;
+ unsigned int leader_space;
unsigned int clock;
unsigned int invert:1;
unsigned int trailer_space;
diff --git a/drivers/media/rc/rc-ir-raw.c b/drivers/media/rc/rc-ir-raw.c
index 3dabb783a1f0..8500b57923c0 100644
--- a/drivers/media/rc/rc-ir-raw.c
+++ b/drivers/media/rc/rc-ir-raw.c
@@ -246,17 +246,15 @@ int ir_raw_gen_manchester(struct ir_raw_event **ev, unsigned int max,
i = BIT_ULL(n - 1);
- if (timings->leader) {
+ if (timings->leader_pulse) {
if (!max--)
return ret;
- if (timings->pulse_space_start) {
- init_ir_raw_event_duration((*ev)++, 1, timings->leader);
-
+ init_ir_raw_event_duration((*ev), 1, timings->leader_pulse);
+ if (timings->leader_space) {
if (!max--)
return ret;
- init_ir_raw_event_duration((*ev), 0, timings->leader);
- } else {
- init_ir_raw_event_duration((*ev), 1, timings->leader);
+ init_ir_raw_event_duration(++(*ev), 0,
+ timings->leader_space);
}
i >>= 1;
} else {

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