libdwfl: Fix memory leak in proc_maps_report on bad file mapping.

Normally last_file is freed inside report(), but in the case of a bad
file mapping we don't call report.

Signed-off-by: Mark Wielaard <mjw@redhat.com>

diff --git a/libdwfl/ChangeLog b/libdwfl/ChangeLog
index 5d400bb..60ed700 100644 (file)
--- a/libdwfl/ChangeLog
+++ b/libdwfl/ChangeLog
@@ -1,3 +1,8 @@
+2016-04-14  Mark Wielaard  <mjw@redhat.com>
+
+       * linux-proc-maps.c (proc_maps_report): Free last_file on bad file
+       mapping.
+
 2016-03-01  Steven Chamberlain  <steven@pyro.eu.org>
 
        * linux-pid-attach.c: Removed unused pid_thread_callbacks,

diff --git a/libdwfl/linux-proc-maps.c b/libdwfl/linux-proc-maps.c
index 94b26d5..4ae1e74 100644 (file)
--- a/libdwfl/linux-proc-maps.c
+++ b/libdwfl/linux-proc-maps.c
@@ -250,7 +250,10 @@ proc_maps_report (Dwfl *dwfl, FILE *f, GElf_Addr sysinfo_ehdr, pid_t pid)
        {
          /* This is another portion of the same file's mapping.  */
          if (strcmp (last_file, file) != 0)
-           goto bad_report;
+           {
+             free (last_file);
+             goto bad_report;
+           }
          high = end;
        }
       else