[PATCH AUTOSEL 4.19 30/59] s390/qeth: Fix error handling during VNICC initialization

Sasha Levin
2019-10-26T13:29:47Z

From: Alexandra Winter <wintera@linux.ibm.com>

[ Upstream commit b528965bcc827dad32a8d21745feaacfc76c9703 ]

Smatch discovered the use of uninitialized variable sup_cmds
in error paths.

Fixes: caa1f0b10d18 ("s390/qeth: add VNICC enable/disable support")
Signed-off-by: Alexandra Winter <wintera@linux.ibm.com>
Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/s390/net/qeth_l2_main.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)

diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index c1c35eccd5b65..e571129c364e4 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -2328,10 +2328,10 @@ static bool qeth_l2_vnicc_recover_char(struct qeth_card *card, u32 vnicc,
static void qeth_l2_vnicc_init(struct qeth_card *card)
{
u32 *timeout = &card->options.vnicc.learning_timeout;
+ bool enable, error = false;
unsigned int chars_len, i;
unsigned long chars_tmp;
u32 sup_cmds, vnicc;
- bool enable, error;

QETH_CARD_TEXT(card, 2, "vniccini");
/* reset rx_bcast */
@@ -2352,7 +2352,10 @@ static void qeth_l2_vnicc_init(struct qeth_card *card)
chars_len = sizeof(card->options.vnicc.sup_chars) * BITS_PER_BYTE;
for_each_set_bit(i, &chars_tmp, chars_len) {
vnicc = BIT(i);
- qeth_l2_vnicc_query_cmds(card, vnicc, &sup_cmds);
+ if (qeth_l2_vnicc_query_cmds(card, vnicc, &sup_cmds)) {
+ sup_cmds = 0;
+ error = true;
+ }
if (!(sup_cmds & IPA_VNICC_SET_TIMEOUT) ||
!(sup_cmds & IPA_VNICC_GET_TIMEOUT))
card->options.vnicc.getset_timeout_sup &= ~vnicc;
@@ -2361,8 +2364,8 @@ static void qeth_l2_vnicc_init(struct qeth_card *card)
card->options.vnicc.set_char_sup &= ~vnicc;
}
/* enforce assumed default values and recover settings, if changed */
- error = qeth_l2_vnicc_recover_timeout(card, QETH_VNICC_LEARNING,
- timeout);
+ error |= qeth_l2_vnicc_recover_timeout(card, QETH_VNICC_LEARNING,
+ timeout);
chars_tmp = card->options.vnicc.wanted_chars ^ QETH_VNICC_DEFAULT;
chars_tmp |= QETH_VNICC_BRIDGE_INVISIBLE;
chars_len = sizeof(card->options.vnicc.wanted_chars) * BITS_PER_BYTE;
--
2.20.1