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[media] go7007: MJPEG buffer overflow 

The go7007 driver has a potential buffer overflow and pointer corruption
bug which causes a crash while capturing MJPEG. The motion detection
(MODET) active_map array can be overflowed by JPEG frame data that
emulates a MODET start code. The active_map overflow overwrites the
active_buf pointer, causing a crash.

The JPEG data that emulated MODET start code was being removed from the
output, resulting in garbled JPEG frames. Therefore ignore MODET start
codes when MODET is not enabled.

Signed-off-by: Pete Eberlein <pete@sensoray.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Pete Eberlein 2010-09-23 14:43:41 -03:00 committed by Mauro Carvalho Chehab
parent 94d4350c54
commit a716e9d75f
1 changed files with 11 additions and 1 deletions
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12
drivers/staging/go7007/go7007-driver.c
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@ -393,7 +393,8 @@ static void write_bitmap_word(struct go7007 *go)
for (i = 0; i < 16; ++i) {
y = (((go->parse_length - 1) << 3) + i) / (go->width >> 4);
x = (((go->parse_length - 1) << 3) + i) % (go->width >> 4);
go->active_map[stride * y + (x >> 3)] |=
if (stride * y + (x >> 3) < sizeof(go->active_map))
go->active_map[stride * y + (x >> 3)] |=
(go->modet_word & 1) << (x & 0x7);
go->modet_word >>= 1;
}
@ -485,6 +486,15 @@ void go7007_parse_video_stream(struct go7007 *go, u8 *buf, int length)
}
break;
case STATE_00_00_01:
if (buf[i] == 0xF8 && go->modet_enable == 0) {
/* MODET start code, but MODET not enabled */
store_byte(go->active_buf, 0x00);
store_byte(go->active_buf, 0x00);
store_byte(go->active_buf, 0x01);
store_byte(go->active_buf, 0xF8);
go->state = STATE_DATA;
break;
}
/* If this is the start of a new MPEG frame,
* get a new buffer */
if ((go->format == GO7007_FORMAT_MPEG1 ||