From bf533acaaa7dee21d49bcaabf8e813ea36bddcd8 Mon Sep 17 00:00:00 2001 From: Pengpeng Hou Date: Tue, 30 Jun 2026 14:56:36 +0800 Subject: media: cx18: stop VBI start-code scan before short tail compress_sliced_buf() scans one byte at a time while testing a four-byte VBI start code. The final iterations can read beyond the remaining buffer tail. Stop the scan once fewer than four bytes remain. Signed-off-by: Pengpeng Hou Signed-off-by: Hans Verkuil --- drivers/media/pci/cx18/cx18-vbi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/media/pci/cx18/cx18-vbi.c b/drivers/media/pci/cx18/cx18-vbi.c index 8dc4ce325935..3a8430f3259e 100644 --- a/drivers/media/pci/cx18/cx18-vbi.c +++ b/drivers/media/pci/cx18/cx18-vbi.c @@ -135,7 +135,7 @@ static u32 compress_sliced_buf(struct cx18 *cx, u8 *buf, u32 size, : VBI_HBLANK_SAMPLES_50HZ; /* find the first valid line */ - for (i = hdr_size, buf += hdr_size; i < size; i++, buf++) { + for (i = hdr_size, buf += hdr_size; i + 3 < size; i++, buf++) { if (buf[0] == 0xff && !buf[1] && !buf[2] && (buf[3] == sliced_vbi_eav_rp[0] || buf[3] == sliced_vbi_eav_rp[1])) -- cgit v1.2.3