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getaddrinfo: Avoid stack copy of IPv6 address

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This commit is contained in:
Florian Weimer 2017-06-21 13:35:37 +02:00
parent 60149b2859
commit 76b8266f99
2 changed files with 10 additions and 40 deletions
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5
ChangeLog
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@ -1,3 +1,8 @@
2017-06-21 Florian Weimer <fweimer@redhat.com>
* sysdeps/posix/getaddrinfo.c (gaih_inet): Call __inet_pton_length
to parse addresses with IPv6 scope IDs.
2017-06-21 Florian Weimer <fweimer@redhat.com> 2017-06-21 Florian Weimer <fweimer@redhat.com>
Add the __inet_pton_length helper function. Add the __inet_pton_length helper function.

43
sysdeps/posix/getaddrinfo.c
View File

@ -539,46 +539,11 @@ gaih_inet (const char *name, const struct gaih_service *service,
{ {
char *scope_delim = strchr (name, SCOPE_DELIMITER); char *scope_delim = strchr (name, SCOPE_DELIMITER);
int e; int e;
if (scope_delim == NULL)
{ e = inet_pton (AF_INET6, name, at->addr);
bool malloc_namebuf = false;
char *namebuf = (char *) name;
if (__glibc_unlikely (scope_delim != NULL))
{
if (malloc_name)
*scope_delim = '\0';
else else
{ e = __inet_pton_length (AF_INET6, name, scope_delim - name,
if (__libc_use_alloca (alloca_used at->addr);
+ scope_delim - name + 1))
{
namebuf = alloca_account (scope_delim - name + 1,
alloca_used);
*((char *) __mempcpy (namebuf, name,
scope_delim - name)) = '\0';
}
else
{
namebuf = __strndup (name, scope_delim - name);
if (namebuf == NULL)
{
assert (!malloc_name);
return -EAI_MEMORY;
}
malloc_namebuf = true;
}
}
}
e = inet_pton (AF_INET6, namebuf, at->addr);
if (malloc_namebuf)
free (namebuf);
else if (scope_delim != NULL && malloc_name)
/* Undo what we did above. */
*scope_delim = SCOPE_DELIMITER;
}
if (e > 0) if (e > 0)
{ {
if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6) if (req->ai_family == AF_UNSPEC || req->ai_family == AF_INET6)