gdb: defer commit resume until all available events are consumed

[deliverable/binutils-gdb.git] / libiberty / objalloc.c

diff --git a/libiberty/objalloc.c b/libiberty/objalloc.c
index d3d2d16e4a5cce25928a38aaedd261cc841746e9..131598f37f4e2755ee6ad25768368c445eab5557 100644 (file)
--- a/libiberty/objalloc.c
+++ b/libiberty/objalloc.c
@@ -1,5 +1,5 @@
 /* objalloc.c -- routines to allocate memory for objects
-   Copyright 1997 Free Software Foundation, Inc.
+   Copyright (C) 1997-2020 Free Software Foundation, Inc.
    Written by Ian Lance Taylor, Cygnus Solutions.
 
 This program is free software; you can redistribute it and/or modify it
@@ -30,10 +30,8 @@ Boston, MA 02110-1301, USA.  */
 #include <unixlib.h>
 #else
 
-#ifdef ANSI_PROTOTYPES
 /* Get a definition for size_t.  */
 #include <stddef.h>
-#endif
 
 #ifdef HAVE_STDLIB_H
 #include <stdlib.h>
@@ -114,8 +112,10 @@ objalloc_create (void)
 /* Allocate space from an objalloc structure.  */
 
 PTR
-_objalloc_alloc (struct objalloc *o, unsigned long len)
+_objalloc_alloc (struct objalloc *o, unsigned long original_len)
 {
+  unsigned long len = original_len;
+
   /* We avoid confusion from zero sized objects by always allocating
      at least 1 byte.  */
   if (len == 0)
@@ -123,6 +123,11 @@ _objalloc_alloc (struct objalloc *o, unsigned long len)
 
   len = (len + OBJALLOC_ALIGN - 1) &~ (OBJALLOC_ALIGN - 1);
 
+  /* Check for overflow in the alignment operation above and the
+     malloc argument below. */
+  if (len + CHUNK_HEADER_SIZE < original_len)
+    return NULL;
+
   if (len <= o->current_space)
     {
       o->current_ptr += len;