[pushed] Fix double-free corruption

[Pedro Alves <palves@redhat.com>]

Fixes a double-free regression introduced by commit b7b030adc405
("Return unique_xmalloc_ptr from target_read_stralloc"):

gdb.sum:
  Running src/gdb/testsuite/gdb.base/catch-syscall.exp ...
  ERROR: Process no longer exists

Valgrind shows:

  (gdb) catch syscall
  ==3687== Thread 1:
  ==3687== Invalid free() / delete / delete[] / realloc()
  ==3687==    at 0x4C29CF0: free (vg_replace_malloc.c:530)
  ==3687==    by 0x610862: xfree(void*) (common-utils.c:101)
  ==3687==    by 0x440D5D: gdb::xfree_deleter<char>::operator()(char*) const (gdb_unique_ptr.h:34)
  ==3687==    by 0x446CC6: std::unique_ptr<char, gdb::xfree_deleter<char> >::reset(char*) (unique_ptr.h:344)
  ==3687==    by 0x81BE50: xml_fetch_content_from_file(char const*, void*) (xml-support.c:1042)
  ==3687==    by 0x81DA86: xml_init_syscalls_info(char const*) (xml-syscall.c:366)
  ==3687==    by 0x81DBDD: init_syscalls_info(gdbarch*) (xml-syscall.c:398)
  ==3687==    by 0x81E131: get_syscall_by_number(gdbarch*, int, syscall*) (xml-syscall.c:599)
  ==3687==    by 0x5BE86F: catch_syscall_command_1(char*, int, cmd_list_element*) (break-catch-syscall.c:481)
  ==3687==    by 0x4B46B1: do_sfunc(cmd_list_element*, char*, int) (cli-decode.c:138)
  ==3687==    by 0x4B76B8: cmd_func(cmd_list_element*, char*, int) (cli-decode.c:1952)
  ==3687==    by 0x7E91C7: execute_command(char*, int) (top.c:615)
  ==3687==  Address 0x14332ae0 is 0 bytes inside a block of size 4,096 free'd
  ==3687==    at 0x4C2AB8B: realloc (vg_replace_malloc.c:785)
  ==3687==    by 0x610792: xrealloc (common-utils.c:62)
  ==3687==    by 0x81BE3E: xml_fetch_content_from_file(char const*, void*) (xml-support.c:1042)
  ==3687==    by 0x81DA86: xml_init_syscalls_info(char const*) (xml-syscall.c:366)
  ==3687==    by 0x81DBDD: init_syscalls_info(gdbarch*) (xml-syscall.c:398)
  ==3687==    by 0x81E131: get_syscall_by_number(gdbarch*, int, syscall*) (xml-syscall.c:599)
  ==3687==    by 0x5BE86F: catch_syscall_command_1(char*, int, cmd_list_element*) (break-catch-syscall.c:481)
  ==3687==    by 0x4B46B1: do_sfunc(cmd_list_element*, char*, int) (cli-decode.c:138)
  ==3687==    by 0x4B76B8: cmd_func(cmd_list_element*, char*, int) (cli-decode.c:1952)
  ==3687==    by 0x7E91C7: execute_command(char*, int) (top.c:615)
  ==3687==    by 0x6A422D: command_handler(char*) (event-top.c:583)
  ==3687==    by 0x6A45F2: command_line_handler(char*) (event-top.c:773)
  [...]

The problem is that if xrealloc decides it needs a new memory block,
it frees the previous block/pointer, and then text.reset() frees it
again.

gdb/ChangeLog:
2017-10-17  Pedro Alves  <palves@redhat.com>

	* xml-support.c (xml_fetch_content_from_file): Call
	unique_ptr::release() instead unique_ptr::get() when passing
	through xrealloc.
---
 gdb/ChangeLog     | 6 ++++++
 gdb/xml-support.c | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index 6a8d16f..65952c4 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,9 @@
+2017-10-17  Pedro Alves  <palves@redhat.com>
+
+	* xml-support.c (xml_fetch_content_from_file): Call
+	unique_ptr::release() instead unique_ptr::get() when passing
+	through xrealloc.
+
 2017-10-17  Yao Qi  <yao.qi@linaro.org>
 
 	* regcache.c (regcache::xfer_part): Remove parameters read and
diff --git a/gdb/xml-support.c b/gdb/xml-support.c
index 76d03b9..42a4c91 100644
--- a/gdb/xml-support.c
+++ b/gdb/xml-support.c
@@ -1039,7 +1039,7 @@ xml_fetch_content_from_file (const char *filename, void *baton)
 	break;
 
       len = len * 2;
-      text.reset ((char *) xrealloc (text.get (), len));
+      text.reset ((char *) xrealloc (text.release (), len));
     }
 
   text.get ()[offset] = '\0';
-- 
2.5.5