Re: [PATCH net-next] net/smc: cast sizeof to int for comparison

On Sep 15 2018, YueHaibing [off-list ref] wrote:

It would perhaps be better to handle len < 0 first.

Andreas.

-- 
Andreas Schwab, schwab@linux-m68k.org
GPG Key fingerprint = 7578 EB47 D4E5 4D69 2510  2552 DF73 E780 A9DA AEC1
"And now for something completely different."

On 2018/9/15 19:35, Andreas Schwab wrote:

On Sep 15 2018, YueHaibing [off-list ref] wrote:

quoted

Comparing an int to a size, which is unsigned, causes the int to become
unsigned, giving the wrong result. kernel_sendmsg can return a negative
error code.

Signed-off-by: YueHaibing <redacted>
---
 net/smc/smc_clc.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index 83aba9a..fd0f5ce 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c

@@ -446,7 +446,7 @@ int smc_clc_send_proposal(struct smc_sock *smc, int smc_type,
 	vec[i++].iov_len = sizeof(trl);
 	/* due to the few bytes needed for clc-handshake this cannot block */
 	len = kernel_sendmsg(smc->clcsock, &msg, vec, i, plen);
-	if (len < sizeof(pclc)) {
+	if (len < (int)sizeof(pclc)) {
 		if (len >= 0) {
 			reason_code = -ENETUNREACH;
 			smc->sk.sk_err = -reason_code;

It would perhaps be better to handle len < 0 first.

That need refactor the err hangding, is worth doing it?

Andreas.