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authorSean Young2017-09-27 16:00:49 -0400
committerMauro Carvalho Chehab2017-12-14 10:35:17 -0500
commit49a4b36ada336270b564cabbbcb727cadebd024d (patch)
tree0b0fe663da36137ed5f84a90d86df035dce0b657 /drivers/media/rc/rc-main.c
parenta60d64b15c20d178ba3a9bc3a542492b4ddeea70 (diff)
media: lirc: validate scancode for transmit
Ensure we reject an attempt to transmit invalid scancodes. Signed-off-by: Sean Young <sean@mess.org> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Diffstat (limited to 'drivers/media/rc/rc-main.c')
-rw-r--r--drivers/media/rc/rc-main.c53
1 files changed, 33 insertions, 20 deletions
diff --git a/drivers/media/rc/rc-main.c b/drivers/media/rc/rc-main.c
index 56b322b3d325..ce8837b1facd 100644
--- a/drivers/media/rc/rc-main.c
+++ b/drivers/media/rc/rc-main.c
@@ -776,6 +776,37 @@ void rc_keydown_notimeout(struct rc_dev *dev, enum rc_proto protocol,
EXPORT_SYMBOL_GPL(rc_keydown_notimeout);
/**
+ * rc_validate_scancode() - checks that a scancode is valid for a protocol
+ * @proto: protocol
+ * @scancode: scancode
+ */
+bool rc_validate_scancode(enum rc_proto proto, u32 scancode)
+{
+ switch (proto) {
+ case RC_PROTO_NECX:
+ if ((((scancode >> 16) ^ ~(scancode >> 8)) & 0xff) == 0)
+ return false;
+ break;
+ case RC_PROTO_NEC32:
+ if ((((scancode >> 24) ^ ~(scancode >> 16)) & 0xff) == 0)
+ return false;
+ break;
+ case RC_PROTO_RC6_MCE:
+ if ((scancode & 0xffff0000) != 0x800f0000)
+ return false;
+ break;
+ case RC_PROTO_RC6_6A_32:
+ if ((scancode & 0xffff0000) == 0x800f0000)
+ return false;
+ break;
+ default:
+ break;
+ }
+
+ return true;
+}
+
+/**
* rc_validate_filter() - checks that the scancode and mask are valid and
* provides sensible defaults
* @dev: the struct rc_dev descriptor of the device
@@ -794,26 +825,8 @@ static int rc_validate_filter(struct rc_dev *dev,
mask = protocols[protocol].scancode_bits;
- switch (protocol) {
- case RC_PROTO_NECX:
- if ((((s >> 16) ^ ~(s >> 8)) & 0xff) == 0)
- return -EINVAL;
- break;
- case RC_PROTO_NEC32:
- if ((((s >> 24) ^ ~(s >> 16)) & 0xff) == 0)
- return -EINVAL;
- break;
- case RC_PROTO_RC6_MCE:
- if ((s & 0xffff0000) != 0x800f0000)
- return -EINVAL;
- break;
- case RC_PROTO_RC6_6A_32:
- if ((s & 0xffff0000) == 0x800f0000)
- return -EINVAL;
- break;
- default:
- break;
- }
+ if (!rc_validate_scancode(protocol, s))
+ return -EINVAL;
filter->data &= mask;
filter->mask &= mask;