From bb71b14d80bde8484ae63ee09d969c72d8615e0c Mon Sep 17 00:00:00 2001 From: Nickolai Zeldovich Date: Mon, 7 Jan 2013 22:28:05 -0300 Subject: [PATCH] [media] drivers/media/pci: use memmove for overlapping regions Change several memcpy() to memmove() in cases when the regions are definitely overlapping; memcpy() of overlapping regions is undefined behavior in C and can produce different results depending on the compiler, the memcpy implementation, etc. Cc: Andy Walls Signed-off-by: Nickolai Zeldovich Signed-off-by: Mauro Carvalho Chehab --- drivers/media/pci/bt8xx/dst_ca.c | 4 ++-- drivers/media/pci/cx18/cx18-vbi.c | 2 +- drivers/media/pci/ivtv/ivtv-vbi.c | 4 ++-- 3 files changed, 5 insertions(+), 5 deletions(-) diff --git a/drivers/media/pci/bt8xx/dst_ca.c b/drivers/media/pci/bt8xx/dst_ca.c index 7d96fab7d246..0e788fca992c 100644 --- a/drivers/media/pci/bt8xx/dst_ca.c +++ b/drivers/media/pci/bt8xx/dst_ca.c @@ -180,11 +180,11 @@ static int ca_get_app_info(struct dst_state *state) put_command_and_length(&state->messages[0], CA_APP_INFO, length); // Copy application_type, application_manufacturer and manufacturer_code - memcpy(&state->messages[4], &state->messages[7], 5); + memmove(&state->messages[4], &state->messages[7], 5); // Set string length and copy string state->messages[9] = str_length; - memcpy(&state->messages[10], &state->messages[12], str_length); + memmove(&state->messages[10], &state->messages[12], str_length); return 0; } diff --git a/drivers/media/pci/cx18/cx18-vbi.c b/drivers/media/pci/cx18/cx18-vbi.c index 6d3121ff45a2..add99642f1e2 100644 --- a/drivers/media/pci/cx18/cx18-vbi.c +++ b/drivers/media/pci/cx18/cx18-vbi.c @@ -84,7 +84,7 @@ static void copy_vbi_data(struct cx18 *cx, int lines, u32 pts_stamp) (the max size of the VBI data is 36 * 43 + 4 bytes). So in this case we use the magic number 'ITV0'. */ memcpy(dst + sd, "ITV0", 4); - memcpy(dst + sd + 4, dst + sd + 12, line * 43); + memmove(dst + sd + 4, dst + sd + 12, line * 43); size = 4 + ((43 * line + 3) & ~3); } else { memcpy(dst + sd, "itv0", 4); diff --git a/drivers/media/pci/ivtv/ivtv-vbi.c b/drivers/media/pci/ivtv/ivtv-vbi.c index 293db806d936..3c156bc70fb4 100644 --- a/drivers/media/pci/ivtv/ivtv-vbi.c +++ b/drivers/media/pci/ivtv/ivtv-vbi.c @@ -224,7 +224,7 @@ static void copy_vbi_data(struct ivtv *itv, int lines, u32 pts_stamp) (the max size of the VBI data is 36 * 43 + 4 bytes). So in this case we use the magic number 'ITV0'. */ memcpy(dst + sd, "ITV0", 4); - memcpy(dst + sd + 4, dst + sd + 12, line * 43); + memmove(dst + sd + 4, dst + sd + 12, line * 43); size = 4 + ((43 * line + 3) & ~3); } else { memcpy(dst + sd, "itv0", 4); @@ -532,7 +532,7 @@ void ivtv_vbi_work_handler(struct ivtv *itv) while (vi->cc_payload_idx) { cc = vi->cc_payload[0]; - memcpy(vi->cc_payload, vi->cc_payload + 1, + memmove(vi->cc_payload, vi->cc_payload + 1, sizeof(vi->cc_payload) - sizeof(vi->cc_payload[0])); vi->cc_payload_idx--; if (vi->cc_payload_idx && cc.odd[0] == 0x80 && cc.odd[1] == 0x80) -- 2.11.0