Fix leak in record-full.c

valgrind detects leaks in several gdb.reverse tests,
such as the below in gdb.reverse/watch-precsave.exp.

Fix the leak by rewriting the loop that frees
record_full_core_buf_list.

gdb/ChangeLog
2019-01-01  Philippe Waroquiers  <philippe.waroquiers@skynet.be>

	* record-full.c (record_full_base_target::close): Rewrite
	record_full_core_buf_list free logic.

==18847== VALGRIND_GDB_ERROR_BEGIN
==18847== 4,120 (24 direct, 4,096 indirect) bytes in 1 blocks are definitely lost in loss record 3,094 of 3,199
==18847==    at 0x4C2BE6D: malloc (vg_replace_malloc.c:309)
==18847==    by 0x405097: xmalloc (common-utils.c:44)
==18847==    by 0x5AF8EA: xnew<record_full_core_buf_entry> (poison.h:110)
==18847==    by 0x5AF8EA: record_full_core_target::xfer_partial(target_object, char const*, unsigned char*, unsigned char const*, unsigned long, unsigned long, unsigned long*) (record-full.c:2182)
==18847==    by 0x64677D: raw_memory_xfer_partial(target_ops*, unsigned char*, unsigned char const*, unsigned long, long, unsigned long*) (target.c:956)
==18847==    by 0x64691E: memory_xfer_partial_1(target_ops*, target_object, unsigned char*, unsigned char const*, unsigned long, unsigned long, unsigned long*) (target.c:1086)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 2402d73..a2d3601 100644 (file)
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,5 +1,10 @@
 2019-01-01  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
 
+       * record-full.c (record_full_base_target::close): Rewrite
+       record_full_core_buf_list free logic.
+
+2019-01-01  Philippe Waroquiers  <philippe.waroquiers@skynet.be>
+
        * break-catch-syscall.c (print_one_catch_syscall): xfree
        the last text.
 

diff --git a/gdb/record-full.c b/gdb/record-full.c
index 2b918ea..8738512 100644 (file)
--- a/gdb/record-full.c
+++ b/gdb/record-full.c
@@ -1014,15 +1014,11 @@ record_full_base_target::close ()
     }
 
   /* Release record_full_core_buf_list.  */
-  if (record_full_core_buf_list)
+  while (record_full_core_buf_list)
     {
-      for (entry = record_full_core_buf_list->prev; entry;
-          entry = entry->prev)
-       {
-         xfree (record_full_core_buf_list);
-         record_full_core_buf_list = entry;
-       }
-      record_full_core_buf_list = NULL;
+      entry = record_full_core_buf_list;
+      record_full_core_buf_list = record_full_core_buf_list->prev;
+      xfree (entry);
     }
 
   if (record_full_async_inferior_event_token)