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Fix leak in mdebugread.c 

Coverity points out that all the "continue;" statements in the switch
case in parse_partial_symbols leak STABSTRING.  This is because we
only release STABSTRING at the end of the scope, with:

     	     	  if (stabstring
		    && stabstring != debug_info->ss + fh->issBase + sh.iss)
		  xfree (stabstring);

but that bit of code is skipped if a case in the switch statement ends
with "continue".

Fix this by using gdb::unique_xmalloc_ptr to manage the heap-allocated
version of 'stabsstring'.

I don't know how to test this.

gdb/ChangeLog:
2019-01-10  Pedro Alves  <palves@redhat.com>

	* mdebugread.c (parse_partial_symbols): Use
	gdb::unique_xmalloc_ptr to manage heap-allocated 'stabsstring'.
This commit is contained in:
Pedro Alves 2019-01-10 17:52:38 +00:00
parent da58495800
commit 36cb72375c
2 changed files with 19 additions and 9 deletions
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5
gdb/ChangeLog
View File

@ -1,3 +1,8 @@
2019-01-10 Pedro Alves <palves@redhat.com>
* mdebugread.c (parse_partial_symbols): Use
gdb::unique_xmalloc_ptr to manage heap-allocated 'stabsstring'.
2019-01-10 Andrew Burgess <andrew.burgess@embecosm.com>
* linux-fork.c (scoped_switch_fork_info)

23
gdb/mdebugread.c
View File

@ -2765,6 +2765,9 @@ parse_partial_symbols (minimal_symbol_reader &reader,
/* Handle stabs continuation. */
{
char *stabstring = debug_info->ss + fh->issBase + sh.iss;
/* If we need to heap-allocate STABSTRING, this owns
it. */
gdb::unique_xmalloc_ptr<char> stabstring_storage;
int len = strlen (stabstring);
while (stabstring[len - 1] == '\\')
@ -2787,14 +2790,19 @@ parse_partial_symbols (minimal_symbol_reader &reader,
stabstring2 = debug_info->ss + fh->issBase + sh2.iss;
len2 = strlen (stabstring2);
/* Concatinate stabstring2 with stabstring1. */
if (stabstring
&& stabstring != debug_info->ss + fh->issBase + sh.iss)
stabstring
= (char *) xrealloc (stabstring, len + len2 + 1);
/* Concatenate stabstring2 with stabstring1. */
if (stabstring_storage != nullptr)
{
stabstring_storage.reset
((char *) xrealloc (stabstring_storage.release (),
len + len2 + 1));
stabstring = stabstring_storage.get ();
}
else
{
stabstring = (char *) xmalloc (len + len2 + 1);
stabstring_storage.reset
((char *) xmalloc (len + len2 + 1));
stabstring = stabstring_storage.get ();
strcpy (stabstring, stabstring1);
}
strcpy (stabstring + len, stabstring2);
@ -3330,9 +3338,6 @@ parse_partial_symbols (minimal_symbol_reader &reader,
hex_string (type_code)); /* CUR_SYMBOL_TYPE */
continue;
}
if (stabstring
&& stabstring != debug_info->ss + fh->issBase + sh.iss)
xfree (stabstring);
}
/* end - Handle continuation */
}