[PATCH AUTOSEL 4.18 31/58] net/smc: fix sizeof to int comparison

Sasha Levin
2018-10-08T15:36:30Z

From: YueHaibing <yuehaibing@huawei.com>

[ Upstream commit 381897798a94065ffcad0772eecdc6b04a7ff23d ]

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 <yuehaibing@huawei.com>
Signed-off-by: Ursula Braun <ubraun@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
net/smc/smc_clc.c | 14 ++++++--------
1 file changed, 6 insertions(+), 8 deletions(-)

diff --git a/net/smc/smc_clc.c b/net/smc/smc_clc.c
index ae5d168653ce..086157555ac3 100644
--- a/net/smc/smc_clc.c
+++ b/net/smc/smc_clc.c
@@ -405,14 +405,12 @@ int smc_clc_send_proposal(struct smc_sock *smc,
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 >= 0) {
- reason_code = -ENETUNREACH;
- smc->sk.sk_err = -reason_code;
- } else {
- smc->sk.sk_err = smc->clcsock->sk->sk_err;
- reason_code = -smc->sk.sk_err;
- }
+ if (len < 0) {
+ smc->sk.sk_err = smc->clcsock->sk->sk_err;
+ reason_code = -smc->sk.sk_err;
+ } else if (len < (int)sizeof(pclc)) {
+ reason_code = -ENETUNREACH;
+ smc->sk.sk_err = -reason_code;
}

return reason_code;
--
2.17.1