Merge pull request #4401 from howard0su/i2c_security

BernardXiong · web-flow · commit 339ebf3c16e4 · 2021-03-01T19:09:12.000+08:00
Return when i2c transfer 0 messages
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];`