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87 lines
2.8 KiB
87 lines
2.8 KiB
commit f7efb43738f255db32cfa4e84a491c09f6da66e2
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Author: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Date: Thu Mar 3 23:07:42 2022 +0530
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getaddrinfo: Fix leak with AI_ALL [BZ #28852]
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Use realloc in convert_hostent_to_gaih_addrtuple and fix up pointers in
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the result list so that a single block is maintained for
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hostbyname3_r/hostbyname2_r and freed in gaih_inet. This result is
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never merged with any other results, since the hosts database does not
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permit merging.
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Resolves BZ #28852.
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Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
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Reviewed-by: DJ Delorie <dj@redhat.com>
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(cherry picked from commit 300460460706ce3ffe29a7df8966e68323ec5bf1)
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diff --git a/sysdeps/posix/getaddrinfo.c b/sysdeps/posix/getaddrinfo.c
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index 5c0d873e1d766099..ed70e6cb3944d219 100644
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--- a/sysdeps/posix/getaddrinfo.c
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+++ b/sysdeps/posix/getaddrinfo.c
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@@ -189,19 +189,16 @@ gaih_inet_serv (const char *servicename, const struct gaih_typeproto *tp,
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return 0;
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}
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-/* Convert struct hostent to a list of struct gaih_addrtuple objects.
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- h_name is not copied, and the struct hostent object must not be
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- deallocated prematurely. *RESULT must be NULL or a pointer to a
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- linked-list. The new addresses are appended at the end. */
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+/* Convert struct hostent to a list of struct gaih_addrtuple objects. h_name
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+ is not copied, and the struct hostent object must not be deallocated
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+ prematurely. The new addresses are appended to the tuple array in
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+ RESULT. */
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static bool
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convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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int family,
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struct hostent *h,
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struct gaih_addrtuple **result)
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{
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- while (*result)
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- result = &(*result)->next;
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-
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/* Count the number of addresses in h->h_addr_list. */
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size_t count = 0;
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for (char **p = h->h_addr_list; *p != NULL; ++p)
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@@ -212,10 +209,30 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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if (count == 0 || h->h_length > sizeof (((struct gaih_addrtuple) {}).addr))
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return true;
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- struct gaih_addrtuple *array = calloc (count, sizeof (*array));
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+ struct gaih_addrtuple *array = *result;
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+ size_t old = 0;
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+
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+ while (array != NULL)
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+ {
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+ old++;
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+ array = array->next;
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+ }
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+
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+ array = realloc (*result, (old + count) * sizeof (*array));
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+
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if (array == NULL)
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return false;
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+ *result = array;
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+
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+ /* Update the next pointers on reallocation. */
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+ for (size_t i = 0; i < old; i++)
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+ array[i].next = array + i + 1;
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+
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+ array += old;
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+
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+ memset (array, 0, count * sizeof (*array));
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+
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for (size_t i = 0; i < count; ++i)
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{
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if (family == AF_INET && req->ai_family == AF_INET6)
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@@ -235,7 +252,6 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req,
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array[0].name = h->h_name;
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array[count - 1].next = NULL;
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- *result = array;
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return true;
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}
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