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authorIngo Molnar <mingo@elte.hu>2008-06-25 12:27:29 +0200
committerIngo Molnar <mingo@elte.hu>2008-06-25 12:27:29 +0200
commit5ce001b0e56638c726270d4f9e05d46d4250dfbb (patch)
treec21cf007ddef99d5e8b23dde9621bd9152e676a8 /drivers/media/dvb/ttpci/av7110_av.c
parent7c9f8861e6c9c839f913e49b98c3854daca18f27 (diff)
parent543cf4cb3fe6f6cae3651ba918b9c56200b257d0 (diff)
Merge branch 'linus' into stackprotectortip-stackprotector-2008-06-25_10.27_Wed
Diffstat (limited to 'drivers/media/dvb/ttpci/av7110_av.c')
-rw-r--r--drivers/media/dvb/ttpci/av7110_av.c34
1 files changed, 27 insertions, 7 deletions
diff --git a/drivers/media/dvb/ttpci/av7110_av.c b/drivers/media/dvb/ttpci/av7110_av.c
index 3e6b650fbb81..ec55a968f204 100644
--- a/drivers/media/dvb/ttpci/av7110_av.c
+++ b/drivers/media/dvb/ttpci/av7110_av.c
@@ -965,8 +965,9 @@ static u8 iframe_header[] = { 0x00, 0x00, 0x01, 0xe0, 0x00, 0x00, 0x80, 0x00, 0x
static int play_iframe(struct av7110 *av7110, char __user *buf, unsigned int len, int nonblock)
{
- int i, n;
+ unsigned i, n;
int progressive = 0;
+ int match = 0;
dprintk(2, "av7110:%p, \n", av7110);
@@ -975,12 +976,31 @@ static int play_iframe(struct av7110 *av7110, char __user *buf, unsigned int len
return -EBUSY;
}
- for (i = 0; i < len - 5; i++) {
- /* get progressive flag from picture extension */
- if (buf[i] == 0x00 && buf[i+1] == 0x00 &&
- buf[i+2] == 0x01 && (unsigned char)buf[i+3] == 0xb5 &&
- (buf[i+4] & 0xf0) == 0x10)
- progressive = buf[i+5] & 0x08;
+ /* search in buf for instances of 00 00 01 b5 1? */
+ for (i = 0; i < len; i++) {
+ unsigned char c;
+ if (get_user(c, buf + i))
+ return -EFAULT;
+ if (match == 5) {
+ progressive = c & 0x08;
+ match = 0;
+ }
+ if (c == 0x00) {
+ match = (match == 1 || match == 2) ? 2 : 1;
+ continue;
+ }
+ switch (match++) {
+ case 2: if (c == 0x01)
+ continue;
+ break;
+ case 3: if (c == 0xb5)
+ continue;
+ break;
+ case 4: if ((c & 0xf0) == 0x10)
+ continue;
+ break;
+ }
+ match = 0;
}
/* setting n always > 1, fixes problems when playing stillframes