From: Siddhesh Poyarekar <siddhesh@sourceware.org>
To: libc-stable@sourceware.org
Cc: DJ Delorie <dj@redhat.com>
Subject: [pushed 2.34 12/14] gaih_inet: Split result generation into its own function
Date: Fri, 15 Sep 2023 20:48:59 -0400 [thread overview]
Message-ID: <20230916004902.1151607-13-siddhesh@sourceware.org> (raw)
In-Reply-To: <20230916004902.1151607-1-siddhesh@sourceware.org>
Simplify the loop a wee bit and clean up variable names too.
Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
Reviewed-by: DJ Delorie <dj@redhat.com>
(cherry picked from commit ac4653ef503d1e87893d1a6714748a1cdf4bf7ad)
---
sysdeps/posix/getaddrinfo.c | 176 ++++++++++++++++++------------------
1 file changed, 86 insertions(+), 90 deletions(-)
diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
index 827c43b369..1008f24736 100644
--- a/sysdeps/posix/getaddrinfo.c
+++ b/sysdeps/posix/getaddrinfo.c
@@ -1030,6 +1030,87 @@ get_local_addresses (const struct addrinfo *req, struct gaih_result *res)
}
}
+/* Generate results in PAI and its count in NADDRS. Return 0 on success or an
+ error code on failure. */
+
+static int
+generate_addrinfo (const struct addrinfo *req, struct gaih_result *res,
+ const struct gaih_servtuple *st, struct addrinfo **pai,
+ unsigned int *naddrs)
+{
+ size_t socklen;
+ sa_family_t family;
+
+ /* Buffer is the size of an unformatted IPv6 address in printable format. */
+ for (struct gaih_addrtuple *at = res->at; at != NULL; at = at->next)
+ {
+ family = at->family;
+ if (family == AF_INET6)
+ {
+ socklen = sizeof (struct sockaddr_in6);
+
+ /* If we looked up IPv4 mapped address discard them here if
+ the caller isn't interested in all address and we have
+ found at least one IPv6 address. */
+ if (res->got_ipv6
+ && (req->ai_flags & (AI_V4MAPPED|AI_ALL)) == AI_V4MAPPED
+ && IN6_IS_ADDR_V4MAPPED (at->addr))
+ continue;
+ }
+ else
+ socklen = sizeof (struct sockaddr_in);
+
+ for (int i = 0; st[i].set; i++)
+ {
+ struct addrinfo *ai;
+ ai = *pai = malloc (sizeof (struct addrinfo) + socklen);
+ if (ai == NULL)
+ return -EAI_MEMORY;
+
+ ai->ai_flags = req->ai_flags;
+ ai->ai_family = family;
+ ai->ai_socktype = st[i].socktype;
+ ai->ai_protocol = st[i].protocol;
+ ai->ai_addrlen = socklen;
+ ai->ai_addr = (void *) (ai + 1);
+
+ /* We only add the canonical name once. */
+ ai->ai_canonname = res->canon;
+ res->canon = NULL;
+
+#ifdef _HAVE_SA_LEN
+ ai->ai_addr->sa_len = socklen;
+#endif /* _HAVE_SA_LEN */
+ ai->ai_addr->sa_family = family;
+
+ /* In case of an allocation error the list must be NULL
+ terminated. */
+ ai->ai_next = NULL;
+
+ if (family == AF_INET6)
+ {
+ struct sockaddr_in6 *sin6p = (struct sockaddr_in6 *) ai->ai_addr;
+ sin6p->sin6_port = st[i].port;
+ sin6p->sin6_flowinfo = 0;
+ memcpy (&sin6p->sin6_addr, at->addr, sizeof (struct in6_addr));
+ sin6p->sin6_scope_id = at->scopeid;
+ }
+ else
+ {
+ struct sockaddr_in *sinp = (struct sockaddr_in *) ai->ai_addr;
+ sinp->sin_port = st[i].port;
+ memcpy (&sinp->sin_addr, at->addr, sizeof (struct in_addr));
+ memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
+ }
+
+ pai = &(ai->ai_next);
+ }
+
+ ++*naddrs;
+ }
+ return 0;
+}
+
static int
gaih_inet (const char *name, const struct gaih_service *service,
const struct addrinfo *req, struct addrinfo **pai,
@@ -1096,98 +1177,13 @@ gaih_inet (const char *name, const struct gaih_service *service,
goto free_and_return;
process_list:
- {
- /* Set up the canonical name if we need it. */
- if ((result = process_canonname (req, orig_name, &res)) != 0)
- goto free_and_return;
-
- struct gaih_addrtuple *at2 = res.at;
- size_t socklen;
- sa_family_t family;
-
- /*
- buffer is the size of an unformatted IPv6 address in printable format.
- */
- while (at2 != NULL)
- {
- family = at2->family;
- if (family == AF_INET6)
- {
- socklen = sizeof (struct sockaddr_in6);
-
- /* If we looked up IPv4 mapped address discard them here if
- the caller isn't interested in all address and we have
- found at least one IPv6 address. */
- if (res.got_ipv6
- && (req->ai_flags & (AI_V4MAPPED|AI_ALL)) == AI_V4MAPPED
- && IN6_IS_ADDR_V4MAPPED (at2->addr))
- goto ignore;
- }
- else
- socklen = sizeof (struct sockaddr_in);
-
- for (int i = 0; st[i].set; i++)
- {
- struct addrinfo *ai;
- ai = *pai = malloc (sizeof (struct addrinfo) + socklen);
- if (ai == NULL)
- {
- result = -EAI_MEMORY;
- goto free_and_return;
- }
-
- ai->ai_flags = req->ai_flags;
- ai->ai_family = family;
- ai->ai_socktype = st[i].socktype;
- ai->ai_protocol = st[i].protocol;
- ai->ai_addrlen = socklen;
- ai->ai_addr = (void *) (ai + 1);
-
- /* We only add the canonical name once. */
- ai->ai_canonname = res.canon;
- res.canon = NULL;
-
-#ifdef _HAVE_SA_LEN
- ai->ai_addr->sa_len = socklen;
-#endif /* _HAVE_SA_LEN */
- ai->ai_addr->sa_family = family;
-
- /* In case of an allocation error the list must be NULL
- terminated. */
- ai->ai_next = NULL;
-
- if (family == AF_INET6)
- {
- struct sockaddr_in6 *sin6p =
- (struct sockaddr_in6 *) ai->ai_addr;
-
- sin6p->sin6_port = st[i].port;
- sin6p->sin6_flowinfo = 0;
- memcpy (&sin6p->sin6_addr,
- at2->addr, sizeof (struct in6_addr));
- sin6p->sin6_scope_id = at2->scopeid;
- }
- else
- {
- struct sockaddr_in *sinp =
- (struct sockaddr_in *) ai->ai_addr;
- sinp->sin_port = st[i].port;
- memcpy (&sinp->sin_addr,
- at2->addr, sizeof (struct in_addr));
- memset (sinp->sin_zero, '\0', sizeof (sinp->sin_zero));
- }
-
- pai = &(ai->ai_next);
- }
-
- ++*naddrs;
+ /* Set up the canonical name if we need it. */
+ if ((result = process_canonname (req, orig_name, &res)) != 0)
+ goto free_and_return;
- ignore:
- at2 = at2->next;
- }
- }
+ result = generate_addrinfo (req, &res, st, pai, naddrs);
- free_and_return:
+free_and_return:
if (malloc_name)
free ((char *) name);
free (addrmem);
--
2.41.0
next prev parent reply other threads:[~2023-09-16 0:49 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-16 0:48 [pushed 2.34 00/14] Backport gaih_inet refactoring and CVE fix Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 01/14] nss: Sort tests and tests-container and put one test per line Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 02/14] gethosts: Remove unused argument _type Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 03/14] gaih_inet: Simplify canon name resolution Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 04/14] getaddrinfo: Fix leak with AI_ALL [BZ #28852] Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 05/14] gaih_inet: Simplify service resolution Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 06/14] gaih_inet: make numeric lookup a separate routine Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 07/14] gaih_inet: Split simple gethostbyname into its own function Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 08/14] gaih_inet: Split nscd lookup code " Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 09/14] gaih_inet: separate nss lookup loop " Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 10/14] gaih_inet: make gethosts into a function Siddhesh Poyarekar
2023-09-16 0:48 ` [pushed 2.34 11/14] gaih_inet: split loopback lookup into its own function Siddhesh Poyarekar
2023-09-16 0:48 ` Siddhesh Poyarekar [this message]
2023-09-16 0:49 ` [pushed 2.34 13/14] gethosts: Return EAI_MEMORY on allocation failure Siddhesh Poyarekar
2023-09-16 0:49 ` [pushed 2.34 14/14] getaddrinfo: Fix use after free in getcanonname (CVE-2023-4806) Siddhesh Poyarekar
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