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Date: Thu, 9 Feb 2023 12:04:24 +0100
From: Alexandra Winter <wintera@...ux.ibm.com>
To: David Miller <davem@...emloft.net>,
Jakub Kicinski <kuba@...nel.org>
Cc: netdev@...r.kernel.org, linux-s390@...r.kernel.org,
Heiko Carstens <hca@...ux.ibm.com>,
Thorsten Winkler <twinkler@...ux.ibm.com>,
Jules Irenge <jbi.octave@...il.com>,
Alexandra Winter <wintera@...ux.ibm.com>
Subject: [PATCH net-next v2 4/4] s390/qeth: Convert sprintf/snprintf to scnprintf
From: Thorsten Winkler <twinkler@...ux.ibm.com>
This LWN article explains the rationale for this change
https: //lwn.net/Articles/69419/
Ie. snprintf() returns what *would* be the resulting length,
while scnprintf() returns the actual length.
Reported-by: Jules Irenge <jbi.octave@...il.com>
Reviewed-by: Alexandra Winter <wintera@...ux.ibm.com>
Signed-off-by: Thorsten Winkler <twinkler@...ux.ibm.com>
Signed-off-by: Alexandra Winter <wintera@...ux.ibm.com>
---
drivers/s390/net/qeth_core_main.c | 14 ++++----
drivers/s390/net/qeth_ethtool.c | 6 ++--
drivers/s390/net/qeth_l2_main.c | 53 ++++++++++++++++---------------
drivers/s390/net/qeth_l3_main.c | 4 +--
drivers/s390/net/qeth_l3_sys.c | 4 +--
5 files changed, 42 insertions(+), 39 deletions(-)
diff --git a/drivers/s390/net/qeth_core_main.c b/drivers/s390/net/qeth_core_main.c
index 8bd9fd51208c..1d5b207c2b9e 100644
--- a/drivers/s390/net/qeth_core_main.c
+++ b/drivers/s390/net/qeth_core_main.c
@@ -2801,9 +2801,11 @@ static void qeth_print_status_message(struct qeth_card *card)
* of the level OSA sets the first character to zero
* */
if (!card->info.mcl_level[0]) {
- sprintf(card->info.mcl_level, "%02x%02x",
- card->info.mcl_level[2],
- card->info.mcl_level[3]);
+ scnprintf(card->info.mcl_level,
+ sizeof(card->info.mcl_level),
+ "%02x%02x",
+ card->info.mcl_level[2],
+ card->info.mcl_level[3]);
break;
}
fallthrough;
@@ -6090,7 +6092,7 @@ void qeth_dbf_longtext(debug_info_t *id, int level, char *fmt, ...)
if (!debug_level_enabled(id, level))
return;
va_start(args, fmt);
- vsnprintf(dbf_txt_buf, sizeof(dbf_txt_buf), fmt, args);
+ vscnprintf(dbf_txt_buf, sizeof(dbf_txt_buf), fmt, args);
va_end(args);
debug_text_event(id, level, dbf_txt_buf);
}
@@ -6330,8 +6332,8 @@ static int qeth_core_probe_device(struct ccwgroup_device *gdev)
goto err_dev;
}
- snprintf(dbf_name, sizeof(dbf_name), "qeth_card_%s",
- dev_name(&gdev->dev));
+ scnprintf(dbf_name, sizeof(dbf_name), "qeth_card_%s",
+ dev_name(&gdev->dev));
card->debug = qeth_get_dbf_entry(dbf_name);
if (!card->debug) {
rc = qeth_add_dbf_entry(card, dbf_name);
diff --git a/drivers/s390/net/qeth_ethtool.c b/drivers/s390/net/qeth_ethtool.c
index e250f49535fa..c1caf7734c3e 100644
--- a/drivers/s390/net/qeth_ethtool.c
+++ b/drivers/s390/net/qeth_ethtool.c
@@ -172,7 +172,7 @@ static void qeth_get_strings(struct net_device *dev, u32 stringset, u8 *data)
qeth_add_stat_strings(&data, prefix, card_stats,
CARD_STATS_LEN);
for (i = 0; i < card->qdio.no_out_queues; i++) {
- snprintf(prefix, ETH_GSTRING_LEN, "tx%u ", i);
+ scnprintf(prefix, ETH_GSTRING_LEN, "tx%u ", i);
qeth_add_stat_strings(&data, prefix, txq_stats,
TXQ_STATS_LEN);
}
@@ -192,8 +192,8 @@ static void qeth_get_drvinfo(struct net_device *dev,
sizeof(info->driver));
strscpy(info->fw_version, card->info.mcl_level,
sizeof(info->fw_version));
- snprintf(info->bus_info, sizeof(info->bus_info), "%s/%s/%s",
- CARD_RDEV_ID(card), CARD_WDEV_ID(card), CARD_DDEV_ID(card));
+ scnprintf(info->bus_info, sizeof(info->bus_info), "%s/%s/%s",
+ CARD_RDEV_ID(card), CARD_WDEV_ID(card), CARD_DDEV_ID(card));
}
static void qeth_get_channels(struct net_device *dev,
diff --git a/drivers/s390/net/qeth_l2_main.c b/drivers/s390/net/qeth_l2_main.c
index c6ded3fdd715..9f13ed170a43 100644
--- a/drivers/s390/net/qeth_l2_main.c
+++ b/drivers/s390/net/qeth_l2_main.c
@@ -1255,37 +1255,38 @@ static void qeth_bridge_emit_host_event(struct qeth_card *card,
switch (evtype) {
case anev_reg_unreg:
- snprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=%s",
- (code & IPA_ADDR_CHANGE_CODE_REMOVAL)
- ? "deregister" : "register");
+ scnprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=%s",
+ (code & IPA_ADDR_CHANGE_CODE_REMOVAL)
+ ? "deregister" : "register");
env[i] = str[i]; i++;
if (code & IPA_ADDR_CHANGE_CODE_VLANID) {
- snprintf(str[i], sizeof(str[i]), "VLAN=%d",
- addr_lnid->lnid);
+ scnprintf(str[i], sizeof(str[i]), "VLAN=%d",
+ addr_lnid->lnid);
env[i] = str[i]; i++;
}
if (code & IPA_ADDR_CHANGE_CODE_MACADDR) {
- snprintf(str[i], sizeof(str[i]), "MAC=%pM",
- addr_lnid->mac);
+ scnprintf(str[i], sizeof(str[i]), "MAC=%pM",
+ addr_lnid->mac);
env[i] = str[i]; i++;
}
- snprintf(str[i], sizeof(str[i]), "NTOK_BUSID=%x.%x.%04x",
- token->cssid, token->ssid, token->devnum);
+ scnprintf(str[i], sizeof(str[i]), "NTOK_BUSID=%x.%x.%04x",
+ token->cssid, token->ssid, token->devnum);
env[i] = str[i]; i++;
- snprintf(str[i], sizeof(str[i]), "NTOK_IID=%02x", token->iid);
+ scnprintf(str[i], sizeof(str[i]), "NTOK_IID=%02x", token->iid);
env[i] = str[i]; i++;
- snprintf(str[i], sizeof(str[i]), "NTOK_CHPID=%02x",
- token->chpid);
+ scnprintf(str[i], sizeof(str[i]), "NTOK_CHPID=%02x",
+ token->chpid);
env[i] = str[i]; i++;
- snprintf(str[i], sizeof(str[i]), "NTOK_CHID=%04x", token->chid);
+ scnprintf(str[i], sizeof(str[i]), "NTOK_CHID=%04x",
+ token->chid);
env[i] = str[i]; i++;
break;
case anev_abort:
- snprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=abort");
+ scnprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=abort");
env[i] = str[i]; i++;
break;
case anev_reset:
- snprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=reset");
+ scnprintf(str[i], sizeof(str[i]), "BRIDGEDHOST=reset");
env[i] = str[i]; i++;
break;
}
@@ -1314,17 +1315,17 @@ static void qeth_bridge_state_change_worker(struct work_struct *work)
NULL
};
- snprintf(env_locrem, sizeof(env_locrem), "BRIDGEPORT=statechange");
- snprintf(env_role, sizeof(env_role), "ROLE=%s",
- (data->role == QETH_SBP_ROLE_NONE) ? "none" :
- (data->role == QETH_SBP_ROLE_PRIMARY) ? "primary" :
- (data->role == QETH_SBP_ROLE_SECONDARY) ? "secondary" :
- "<INVALID>");
- snprintf(env_state, sizeof(env_state), "STATE=%s",
- (data->state == QETH_SBP_STATE_INACTIVE) ? "inactive" :
- (data->state == QETH_SBP_STATE_STANDBY) ? "standby" :
- (data->state == QETH_SBP_STATE_ACTIVE) ? "active" :
- "<INVALID>");
+ scnprintf(env_locrem, sizeof(env_locrem), "BRIDGEPORT=statechange");
+ scnprintf(env_role, sizeof(env_role), "ROLE=%s",
+ (data->role == QETH_SBP_ROLE_NONE) ? "none" :
+ (data->role == QETH_SBP_ROLE_PRIMARY) ? "primary" :
+ (data->role == QETH_SBP_ROLE_SECONDARY) ? "secondary" :
+ "<INVALID>");
+ scnprintf(env_state, sizeof(env_state), "STATE=%s",
+ (data->state == QETH_SBP_STATE_INACTIVE) ? "inactive" :
+ (data->state == QETH_SBP_STATE_STANDBY) ? "standby" :
+ (data->state == QETH_SBP_STATE_ACTIVE) ? "active" :
+ "<INVALID>");
kobject_uevent_env(&data->card->gdev->dev.kobj,
KOBJ_CHANGE, env);
kfree(data);
diff --git a/drivers/s390/net/qeth_l3_main.c b/drivers/s390/net/qeth_l3_main.c
index 1cf4e354693f..af4e60d2917e 100644
--- a/drivers/s390/net/qeth_l3_main.c
+++ b/drivers/s390/net/qeth_l3_main.c
@@ -47,9 +47,9 @@ int qeth_l3_ipaddr_to_string(enum qeth_prot_versions proto, const u8 *addr,
char *buf)
{
if (proto == QETH_PROT_IPV4)
- return sprintf(buf, "%pI4", addr);
+ return scnprintf(buf, INET_ADDRSTRLEN, "%pI4", addr);
else
- return sprintf(buf, "%pI6", addr);
+ return scnprintf(buf, INET6_ADDRSTRLEN, "%pI6", addr);
}
static struct qeth_ipaddr *qeth_l3_find_addr_by_ip(struct qeth_card *card,
diff --git a/drivers/s390/net/qeth_l3_sys.c b/drivers/s390/net/qeth_l3_sys.c
index f3986c6e21b9..9f90a860ca2c 100644
--- a/drivers/s390/net/qeth_l3_sys.c
+++ b/drivers/s390/net/qeth_l3_sys.c
@@ -252,8 +252,8 @@ static ssize_t qeth_l3_dev_hsuid_store(struct device *dev,
goto out;
}
- snprintf(card->options.hsuid, sizeof(card->options.hsuid),
- "%-8s", tmp);
+ scnprintf(card->options.hsuid, sizeof(card->options.hsuid),
+ "%-8s", tmp);
ASCEBC(card->options.hsuid, 8);
memcpy(card->dev->perm_addr, card->options.hsuid, 9);
--
2.37.2
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