On Tue, 2018-06-26 at 09:16 +0800, Chengguang Xu wrote:
> sizeof() will return unsigned value so in the error check
> negative error code will be always larger than sizeof().
This looks like a general class of error in the kernel
where a signed result that could be returning a -errno
is tested against < or <= sizeof()
A couple examples:
drivers/input/mouse/elan_i2c_smbus.c:
len = i2c_smbus_read_block_data(client,
ETP_SMBUS_IAP_PASSWORD_READ,
val);
if (len < sizeof(u16)) {
i2c_smbus_read_block_data can return a negative errno
net/smc/smc_clc.c:
len = kernel_sendmsg(smc->clcsock, &msg, &vec, 1,
sizeof(struct smc_clc_msg_decline));
if (len < sizeof(struct smc_clc_msg_decline))
where kernel_sendmsg can return a negative errno
There are probably others, I didn't look hard.
Perhaps a cocci script to find these could be generated?
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