From: Mark Wielaard <mjw@redhat.com>
Date: Mon, 15 Dec 2014 15:56:49 +0000 (+0100)
Subject: libdw: dwarf_getpubnames set error to DWARF_E_NO_ENTRY for zero entries.
X-Git-Tag: elfutils-0.161~19
X-Git-Url: http://git.ipfire.org/gitweb.cgi?a=commitdiff_plain;h=138a9ba2be7e2df2423f86c9ddcca7322648e426;p=thirdparty%2Felfutils.git

libdw: dwarf_getpubnames set error to DWARF_E_NO_ENTRY for zero entries.

realloc in get_offsets will return NULL otherwise and dwarf_getpubnames
might think there was no issue and try to use that NULL pointer.

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

diff --git a/libdw/ChangeLog b/libdw/ChangeLog
index 068d45212..f1f7b1d16 100644
--- a/libdw/ChangeLog
+++ b/libdw/ChangeLog
@@ -1,7 +1,7 @@
 2014-12-15  Mark Wielaard  <mjw@redhat.com>
 
 	* dwarf_getpubnames.c (get_offsets): Make sure whole unit fall inside
-	section data.
+	section data. Set error to DWARF_E_NO_ENTRY if cnt is zero.
 	(dwarf_getpubnames): Make sure section data contains string zero
 	terminator.
 
diff --git a/libdw/dwarf_getpubnames.c b/libdw/dwarf_getpubnames.c
index c8b9f9f6c..9fbfcbf3d 100644
--- a/libdw/dwarf_getpubnames.c
+++ b/libdw/dwarf_getpubnames.c
@@ -125,7 +125,7 @@ get_offsets (Dwarf *dbg)
       readp += len;
     }
 
-  if (mem == NULL)
+  if (mem == NULL || cnt == 0)
     {
       __libdw_seterrno (DWARF_E_NO_ENTRY);
       return -1;