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authorNickolai Zeldovich <nickolai@csail.mit.edu>2013-01-07 22:28:05 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2013-02-05 19:26:38 -0200
commitbb71b14d80bde8484ae63ee09d969c72d8615e0c (patch)
tree33a3cb8bb2419c1a46d669a331f79c66e12cf4f3 /drivers/media
parent22331a5e0a493f8edfbd504bb58bd03d308ddb0c (diff)
[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 <awalls@md.metrocast.net> Signed-off-by: Nickolai Zeldovich <nickolai@csail.mit.edu> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/pci/bt8xx/dst_ca.c4
-rw-r--r--drivers/media/pci/cx18/cx18-vbi.c2
-rw-r--r--drivers/media/pci/ivtv/ivtv-vbi.c4
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)

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