Return when i2c transfer 0 messages

howard0su · howard0su · commit 5a184c19b21b · 2021-02-28T16:42:27.000+08:00
msg-&gt;flags is accessed without proper intialized msg variable.
diff --git a/components/drivers/i2c/i2c-bit-ops.c b/components/drivers/i2c/i2c-bit-ops.c
@@ -375,6 +375,8 @@ static rt_size_t i2c_bit_xfer(struct rt_i2c_bus_device *bus,
     rt_int32_t i, ret;
     rt_uint16_t ignore_nack;
 
+    if (num == 0) return 0;
+
     for (i = 0; i < num; i++)
     {
         msg = &msgs[i];

Original file line number	Diff line number	Diff line change
`@@ -375,6 +375,8 @@ static rt_size_t i2c_bit_xfer(struct rt_i2c_bus_device *bus,`
`375`	`375`	`rt_int32_t i, ret;`
`376`	`376`	`rt_uint16_t ignore_nack;`
`377`	`377`
	`378`	`+ if (num == 0) return 0;`
	`379`	`+`
`378`	`380`	`for (i = 0; i < num; i++)`
`379`	`381`	`{`
`380`	`382`	`msg = &msgs[i];`