GNU C Library master sources branch master updated. glibc-2.26-220-g5898f45

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http://sourceware.org/git/gitweb.cgi?p=glibc.git;a=commitdiff;h=5898f4548efdcd7c0fd437a74eeb80facc51a117

commit 5898f4548efdcd7c0fd437a74eeb80facc51a117
Author: Florian Weimer <fweimer@redhat.com>
Date:   Wed Aug 30 20:10:56 2017 +0200

    dynarray: Set errno on overflow-induced allocation failure
    
    This allows the caller to return directly on such an error, with an
    appropriate errno value.

diff --git a/ChangeLog b/ChangeLog
index b0f01c2..1d8bcde 100644
--- a/ChangeLog
+++ b/ChangeLog
@@ -1,5 +1,13 @@
 2017-08-30  Florian Weimer  <fweimer@redhat.com>
 
+	* malloc/dynarray_emplace_enlarge.c
+	(__libc_dynarray_emplace_enlarge): Set errno on overflow.
+	* malloc/dynarray_resize.c (__libc_dynarray_resize): Likewise.
+	* malloc/tst-dynarray.c (test_long_overflow): New function.
+	(do_test): Call it.
+
+2017-08-30  Florian Weimer  <fweimer@redhat.com>
+
 	* malloc/malloc.c (ARENA_CORRUPTION_BIT, arena_is_corrupt)
 	(set_arena_corrupt): Remove definitions.
 	(mtrim): Do not check for corrupt arena.
diff --git a/malloc/dynarray_emplace_enlarge.c b/malloc/dynarray_emplace_enlarge.c
index dfc7001..0fb0327 100644
--- a/malloc/dynarray_emplace_enlarge.c
+++ b/malloc/dynarray_emplace_enlarge.c
@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <dynarray.h>
+#include <errno.h>
 #include <malloc-internal.h>
 #include <stdlib.h>
 #include <string.h>
@@ -43,8 +44,11 @@ __libc_dynarray_emplace_enlarge (struct dynarray_header *list,
     {
       new_allocated = list->allocated + list->allocated / 2 + 1;
       if (new_allocated <= list->allocated)
-        /* Overflow.  */
-        return false;
+        {
+          /* Overflow.  */
+          __set_errno (ENOMEM);
+          return false;
+        }
     }
 
   size_t new_size;
diff --git a/malloc/dynarray_resize.c b/malloc/dynarray_resize.c
index e6dc9fb..63c981b 100644
--- a/malloc/dynarray_resize.c
+++ b/malloc/dynarray_resize.c
@@ -17,6 +17,7 @@
    <http://www.gnu.org/licenses/>.  */
 
 #include <dynarray.h>
+#include <errno.h>
 #include <malloc-internal.h>
 #include <stdlib.h>
 #include <string.h>
@@ -38,7 +39,11 @@ __libc_dynarray_resize (struct dynarray_header *list, size_t size,
 
   size_t new_size_bytes;
   if (check_mul_overflow_size_t (size, element_size, &new_size_bytes))
-    return false;
+    {
+      /* Overflow.  */
+      __set_errno (ENOMEM);
+      return false;
+    }
   void *new_array;
   if (list->array == scratch)
     {
diff --git a/malloc/tst-dynarray.c b/malloc/tst-dynarray.c
index 2206d75..d11f7bb 100644
--- a/malloc/tst-dynarray.c
+++ b/malloc/tst-dynarray.c
@@ -18,6 +18,9 @@
 
 #include "tst-dynarray-shared.h"
 
+#include <errno.h>
+#include <stdint.h>
+
 #define DYNARRAY_STRUCT dynarray_long
 #define DYNARRAY_ELEMENT long
 #define DYNARRAY_PREFIX dynarray_long_
@@ -463,6 +466,31 @@ test_long_init (void)
   }
 }
 
+/* Test overflow in resize.  */
+static void
+test_long_overflow (void)
+{
+  {
+    struct dynarray_long dyn;
+    dynarray_long_init (&dyn);
+    errno = EINVAL;
+    TEST_VERIFY (!dynarray_long_resize
+                 (&dyn, (SIZE_MAX / sizeof (long)) + 1));
+    TEST_VERIFY (errno == ENOMEM);
+    TEST_VERIFY (dynarray_long_has_failed (&dyn));
+  }
+
+  {
+    struct dynarray_long_noscratch dyn;
+    dynarray_long_noscratch_init (&dyn);
+    errno = EINVAL;
+    TEST_VERIFY (!dynarray_long_noscratch_resize
+                 (&dyn, (SIZE_MAX / sizeof (long)) + 1));
+    TEST_VERIFY (errno == ENOMEM);
+    TEST_VERIFY (dynarray_long_noscratch_has_failed (&dyn));
+  }
+}
+
 /* Test NUL-terminated string construction with the add function and
    the simple finalize function.  */
 static void
@@ -538,6 +566,7 @@ do_test (void)
   test_int ();
   test_str ();
   test_long_init ();
+  test_long_overflow ();
   test_zstr ();
   return 0;
 }

-----------------------------------------------------------------------

Summary of changes:
 ChangeLog                         |    8 ++++++++
 malloc/dynarray_emplace_enlarge.c |    8 ++++++--
 malloc/dynarray_resize.c          |    7 ++++++-
 malloc/tst-dynarray.c             |   29 +++++++++++++++++++++++++++++
 4 files changed, 49 insertions(+), 3 deletions(-)


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