[glibc] nss: Use reallocarray to prevent integer overflow in getaddrinfo (bug 33977)

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=c1e0787b56f9ebd51d642c21b785143984f3e1f1

commit c1e0787b56f9ebd51d642c21b785143984f3e1f1
Author: Marcus Poller <[email protected]>
Date:   Mon Jul 6 10:37:32 2026 +0200

    nss: Use reallocarray to prevent integer overflow in getaddrinfo (bug 33977)
    
    replacing realloc by reallocarray introduces a basic overflow check.
    (old + count) might still overflow, but since the NSS backend is trusted,
    we do not consider this to be a valid case.
    
    Reviewed-by: Adhemerval Zanella <[email protected]>

Diff:
---
 nss/getaddrinfo.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/nss/getaddrinfo.c b/nss/getaddrinfo.c
index 4f6ac3358a..45b7f728a1 100644
--- a/nss/getaddrinfo.c
+++ b/nss/getaddrinfo.c
@@ -234,7 +234,7 @@ convert_hostent_to_gaih_addrtuple (const struct addrinfo *req, int family,
       array = array->next;
     }
 
-  array = realloc (res->at, (old + count) * sizeof (*array));
+  array = __libc_reallocarray (res->at, old + count, sizeof (*array));
 
   if (array == NULL)
     return false;