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.
Signed-off-by: Nickolai Zeldovich <nicko...@csail.mit.edu>
---
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 7d96fab..0e788fc 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 6d3121f..add9964 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 293db80..3c156bc 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)
--
1.7.10.4
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