Fix error code for too small input buffer to getnameinfo

3 files changed, 14 insertions, 9 deletions

diff --git a/ChangeLog b/ChangeLog
index e650d53099..d49f945bb0 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,9 @@
 2011-12-22  Ulrich Drepper  <drepper@gmail.com>
 
+	[BZ #13166]
+	* inet/getnameinfo.c (getnameinfo): Return EAI_OVERFLOW if the
+	buffer for the output is too small.
+
 	* sysdeps/i386/fpu/bits/fenv.h [__SSE_MATH__]: Add feraiseexcept
 	optimization.
 
diff --git a/NEWS b/NEWS
index ea946e3a58..fe57b58520 100644
--- a/NEWS
+++ b/NEWS
@@ -11,10 +11,10 @@ Version 2.15
 
   6779, 6783, 9696, 10103, 10709, 11589, 12403, 12847, 12868, 12852, 12874,
   12885, 12892, 12907, 12922, 12935, 13007, 13021, 13067, 13068, 13090,
-  13092, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13179, 13185,
-  13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335, 13337,
-  13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472, 13484,
-  13506, 13515, 13523, 13524, 13538, 13540
+  13092, 13114, 13118, 13123, 13134, 13138, 13147, 13150, 13166, 13179,
+  13185, 13189, 13192, 13268, 13276, 13282, 13291, 13305, 13328, 13335,
+  13337, 13344, 13358, 13367, 13413, 13416, 13423, 13439, 13446, 13472,
+  13484, 13506, 13515, 13523, 13524, 13538, 13540
 
 * New program pldd to list loaded object of a process
   Implemented by Ulrich Drepper.
diff --git a/inet/getnameinfo.c b/inet/getnameinfo.c
index 6fb6ad6e1d..436604b756 100644
--- a/inet/getnameinfo.c
+++ b/inet/getnameinfo.c
@@ -346,10 +346,11 @@ getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
 						     "%u", scopeid);
 
 			if (real_hostlen + scopelen + 1 > hostlen)
-			  /* XXX We should not fail here.  Simply enlarge
-			     the buffer or return with out of memory.  */
-			  return EAI_SYSTEM;
-			memcpy (host + real_hostlen, scopebuf, scopelen + 1);
+			  /* Signal the buffer is too small.  This is
+			     what inet_ntop does.  */
+			  c = NULL;
+			else
+			  memcpy (host + real_hostlen, scopebuf, scopelen + 1);
 		      }
 		  }
 		else
@@ -357,7 +358,7 @@ getnameinfo (const struct sockaddr *sa, socklen_t addrlen, char *host,
 				 (const void *) &(((const struct sockaddr_in *) sa)->sin_addr),
 				 host, hostlen);
 		if (c == NULL)
-		  return EAI_SYSTEM;
+		  return EAI_OVERFLOW;
 	      }
 	    ok = 1;
 	  }