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path: root/drivers/media/dvb-frontends/nxt200x.c
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Diffstat (limited to 'drivers/media/dvb-frontends/nxt200x.c')
-rw-r--r--drivers/media/dvb-frontends/nxt200x.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/nxt200x.c b/drivers/media/dvb-frontends/nxt200x.c
index 8e288940a61f..fbca9856313a 100644
--- a/drivers/media/dvb-frontends/nxt200x.c
+++ b/drivers/media/dvb-frontends/nxt200x.c
@@ -39,6 +39,9 @@
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+/* Max transfer size done by I2C transfer functions */
+#define MAX_XFER_SIZE 64
+
#define NXT2002_DEFAULT_FIRMWARE "dvb-fe-nxt2002.fw"
#define NXT2004_DEFAULT_FIRMWARE "dvb-fe-nxt2004.fw"
#define CRC_CCIT_MASK 0x1021
@@ -95,10 +98,16 @@ static int i2c_readbytes(struct nxt200x_state *state, u8 addr, u8 *buf, u8 len)
static int nxt200x_writebytes (struct nxt200x_state* state, u8 reg,
const u8 *buf, u8 len)
{
- u8 buf2 [len+1];
+ u8 buf2[MAX_XFER_SIZE];
int err;
struct i2c_msg msg = { .addr = state->config->demod_address, .flags = 0, .buf = buf2, .len = len + 1 };
+ if (1 + len > sizeof(buf2)) {
+ pr_warn("%s: i2c wr reg=%04x: len=%d is too big!\n",
+ __func__, reg, len);
+ return -EINVAL;
+ }
+
buf2[0] = reg;
memcpy(&buf2[1], buf, len);