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libiberty: Fix memory leak in ada_demangle when symbol cannot be demangled.

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When a symbol cannot be demangled in ada_demangle a new demangled VEC
will be allocated without deleting the demangled VEC already in use.

Running testsuite/test-demangle under valgrind will show the leak for
this entry in testsuite/demangle-expected:

    # Elaborated flag (not demangled)
    --format=gnat
    x_E
    <x_E>

 11 bytes in 1 blocks are definitely lost in loss record 1 of 1
    at 0x4C27BE3: malloc (vg_replace_malloc.c:299)
    by 0x413FE7: xmalloc (xmalloc.c:148)
    by 0x4025EC: ada_demangle (cplus-dem.c:930)
    by 0x402C59: cplus_demangle (cplus-dem.c:892)
    by 0x400FEC: main (test-demangle.c:317)

libiberty/ChangeLog:

	* cplus-dem.c (ada_demangle): Initialize demangled to NULL and
	XDELETEVEC demangled when unknown.
This commit is contained in:
Mark Wielaard 2016-11-01 23:13:10 +00:00 committed by Mark Wielaard
parent 9d2cdc8657
commit aba19b625f
2 changed files with 7 additions and 1 deletions
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5
libiberty/ChangeLog
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@ -1,3 +1,8 @@
2016-10-31 Mark Wielaard <mjw@redhat.com>
* cplus-dem.c (ada_demangle): Initialize demangled to NULL and
XDELETEVEC demangled when unknown.
2016-10-17 Nick Clifton <nickc@redhat.com>
* Sync with gcc.

3
libiberty/cplus-dem.c
View File

@ -911,7 +911,7 @@ ada_demangle (const char *mangled, int option ATTRIBUTE_UNUSED)
int len0;
const char* p;
char *d;
char *demangled;
char *demangled = NULL;
/* Discard leading _ada_, which is used for library level subprograms. */
if (strncmp (mangled, "_ada_", 5) == 0)
@ -1156,6 +1156,7 @@ ada_demangle (const char *mangled, int option ATTRIBUTE_UNUSED)
return demangled;
unknown:
XDELETEVEC (demangled);
len0 = strlen (mangled);
demangled = XNEWVEC (char, len0 + 3);