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path: root/drivers/media/dvb-frontends/mt312.c
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Diffstat (limited to 'drivers/media/dvb-frontends/mt312.c')
-rw-r--r--drivers/media/dvb-frontends/mt312.c10
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/media/dvb-frontends/mt312.c b/drivers/media/dvb-frontends/mt312.c
index ec388c1d..a74ac0d 100644
--- a/drivers/media/dvb-frontends/mt312.c
+++ b/drivers/media/dvb-frontends/mt312.c
@@ -36,6 +36,8 @@
#include "mt312_priv.h"
#include "mt312.h"
+/* Max transfer size done by I2C transfer functions */
+#define MAX_XFER_SIZE 64
struct mt312_state {
struct i2c_adapter *i2c;
@@ -96,9 +98,15 @@ static int mt312_write(struct mt312_state *state, const enum mt312_reg_addr reg,
const u8 *src, const size_t count)
{
int ret;
- u8 buf[count + 1];
+ u8 buf[MAX_XFER_SIZE];
struct i2c_msg msg;
+ if (1 + count > sizeof(buf)) {
+ printk(KERN_WARNING
+ "mt312: write: len=%zd is too big!\n", count);
+ return -EINVAL;
+ }
+
if (debug) {
int i;
dprintk("W(%d):", reg & 0x7f);
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