binutils/binutils-CVE-2018-7568.patch

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--- binutils.orig/bfd/dwarf1.c 2018-05-01 13:04:35.060041875 +0100
+++ binutils-2.30/bfd/dwarf1.c 2018-05-01 13:24:17.943833855 +0100
@@ -213,6 +213,7 @@ parse_die (bfd * abfd,
/* Then the attributes. */
while (xptr + 2 <= aDiePtrEnd)
{
+ unsigned int block_len;
unsigned short attr;
/* Parse the attribute based on its form. This section
@@ -255,12 +256,24 @@ parse_die (bfd * abfd,
break;
case FORM_BLOCK2:
if (xptr + 2 <= aDiePtrEnd)
- xptr += bfd_get_16 (abfd, xptr);
+ {
+ block_len = bfd_get_16 (abfd, xptr);
+ if (xptr + block_len > aDiePtrEnd
+ || xptr + block_len < xptr)
+ return FALSE;
+ xptr += block_len;
+ }
xptr += 2;
break;
case FORM_BLOCK4:
if (xptr + 4 <= aDiePtrEnd)
- xptr += bfd_get_32 (abfd, xptr);
+ {
+ block_len = bfd_get_32 (abfd, xptr);
+ if (xptr + block_len > aDiePtrEnd
+ || xptr + block_len < xptr)
+ return FALSE;
+ xptr += block_len;
+ }
xptr += 4;
break;
case FORM_STRING: