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lib/libnetlink: Don't pass NULL parameter to memcpy() 

Both addattr_l() and rta_addattr_l() may be called with NULL data
pointer and 0 alen parameters. Avoid calling memcpy() in that case.

Signed-off-by: Phil Sutter <phil@nwl.cc>
This commit is contained in:
Phil Sutter 2017-08-24 11:41:31 +02:00 committed by Stephen Hemminger
parent ac3415f5c1
commit 893deac4c4
1 changed files with 4 additions and 2 deletions
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6
lib/libnetlink.c
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@ -870,7 +870,8 @@ int addattr_l(struct nlmsghdr *n, int maxlen, int type, const void *data,
rta = NLMSG_TAIL(n);
rta->rta_type = type;
rta->rta_len = len;
memcpy(RTA_DATA(rta), data, alen);
if (alen)
memcpy(RTA_DATA(rta), data, alen);
n->nlmsg_len = NLMSG_ALIGN(n->nlmsg_len) + RTA_ALIGN(len);
return 0;
}
@ -957,7 +958,8 @@ int rta_addattr_l(struct rtattr *rta, int maxlen, int type,
subrta = (struct rtattr *)(((char *)rta) + RTA_ALIGN(rta->rta_len));
subrta->rta_type = type;
subrta->rta_len = len;
memcpy(RTA_DATA(subrta), data, alen);
if (alen)
memcpy(RTA_DATA(subrta), data, alen);
rta->rta_len = NLMSG_ALIGN(rta->rta_len) + RTA_ALIGN(len);
return 0;
}