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network: use automatic stack allocation and structured init

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This commit is contained in:
Zbigniew Jędrzejewski-Szmek 2020-01-08 12:08:48 +01:00
parent 6666c4faee
commit 0475919b56
1 changed files with 13 additions and 15 deletions
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28
src/shared/ethtool-util.c
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@ -221,8 +221,16 @@ int ethtool_get_link_info(int *ethtool_fd, const char *ifname,
int ethtool_get_permanent_macaddr(int *ethtool_fd, const char *ifname, struct ether_addr *ret) {
_cleanup_close_ int fd = -1;
_cleanup_free_ struct ethtool_perm_addr *epaddr = NULL;
struct ifreq ifr;
struct {
struct ethtool_perm_addr addr;
uint8_t space[MAX_ADDR_LEN];
} epaddr = {
.addr.cmd = ETHTOOL_GPERMADDR,
.addr.size = MAX_ADDR_LEN,
};
struct ifreq ifr = {
.ifr_data = (caddr_t) &epaddr,
};
int r;
assert(ifname);
@ -237,27 +245,17 @@ int ethtool_get_permanent_macaddr(int *ethtool_fd, const char *ifname, struct et
return r;
}
epaddr = malloc(offsetof(struct ethtool_perm_addr, data) + MAX_ADDR_LEN);
if (!epaddr)
return -ENOMEM;
epaddr->cmd = ETHTOOL_GPERMADDR;
epaddr->size = MAX_ADDR_LEN;
ifr = (struct ifreq) {
.ifr_data = (caddr_t) epaddr,
};
strscpy(ifr.ifr_name, IFNAMSIZ, ifname);
r = ioctl(*ethtool_fd, SIOCETHTOOL, &ifr);
if (r < 0)
return -errno;
if (epaddr->size != 6)
if (epaddr.addr.size != 6)
return -EOPNOTSUPP;
for (size_t i = 0; i < epaddr->size; i++)
ret->ether_addr_octet[i] = epaddr->data[i];
for (size_t i = 0; i < epaddr.addr.size; i++)
ret->ether_addr_octet[i] = epaddr.addr.data[i];
return 0;
}