Fix dwarf_getmacros so that it passes newly-added test
diff --git a/libdw/dwarf_getmacros.c b/libdw/dwarf_getmacros.c
index 743ade3..5f24d37 100644
--- a/libdw/dwarf_getmacros.c
+++ b/libdw/dwarf_getmacros.c
@@ -75,17 +75,20 @@
if (INTUSE(dwarf_formudata) (&attr, &macoff) != 0)
return -1;
- const unsigned char *readp
- = die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_buf + offset;
- const unsigned char *readendp
- = readp + die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_size;
+ Elf_Data *d = die->cu->dbg->sectiondata[IDX_debug_macinfo];
+ if (unlikely (d == NULL) || unlikely (d->d_buf == NULL))
+ {
+ __libdw_seterrno (DWARF_E_NO_ENTRY);
+ return -1;
+ }
+
+ const unsigned char *macdata = d->d_buf + macoff;
+ const unsigned char *readp = macdata + offset;
+ const unsigned char *readendp = d->d_buf + d->d_size;
if (readp == readendp)
return 0;
- if (*readp != DW_MACINFO_start_file)
- goto invalid;
-
while (readp < readendp)
{
unsigned int opcode = *readp++;
@@ -142,9 +145,7 @@
mac.param2.s = str;
if (callback (&mac, arg) != DWARF_CB_OK)
- return (readp
- - ((unsigned char *) die->cu->dbg->sectiondata[IDX_debug_macinfo]->d_buf
- + offset));
+ return readp - macdata;
}
/* If we come here the termination of the data for the CU is not
