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c27370 |
--- binutils.orig/bfd/dwarf1.c 2018-05-15 17:25:27.656131299 +0100
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c27370 |
+++ binutils-2.27/bfd/dwarf1.c 2018-05-15 17:29:04.176057372 +0100
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c27370 |
@@ -208,6 +208,7 @@ parse_die (bfd * abfd,
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c27370 |
/* Then the attributes. */
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c27370 |
while (xptr < (this_die + aDieInfo->length))
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c27370 |
{
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c27370 |
+ unsigned int block_len;
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c27370 |
unsigned short attr;
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c27370 |
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c27370 |
/* Parse the attribute based on its form. This section
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c27370 |
@@ -223,12 +224,15 @@ parse_die (bfd * abfd,
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c27370 |
break;
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c27370 |
case FORM_DATA4:
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c27370 |
case FORM_REF:
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c27370 |
- if (attr == AT_sibling)
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c27370 |
- aDieInfo->sibling = bfd_get_32 (abfd, (bfd_byte *) xptr);
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c27370 |
- else if (attr == AT_stmt_list)
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c27370 |
+ if (xptr + 4 <= aDiePtrEnd)
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c27370 |
{
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c27370 |
- aDieInfo->stmt_list_offset = bfd_get_32 (abfd, (bfd_byte *) xptr);
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c27370 |
- aDieInfo->has_stmt_list = 1;
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c27370 |
+ if (attr == AT_sibling)
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c27370 |
+ aDieInfo->sibling = bfd_get_32 (abfd, xptr);
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c27370 |
+ else if (attr == AT_stmt_list)
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c27370 |
+ {
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c27370 |
+ aDieInfo->stmt_list_offset = bfd_get_32 (abfd, xptr);
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c27370 |
+ aDieInfo->has_stmt_list = 1;
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c27370 |
+ }
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c27370 |
}
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c27370 |
xptr += 4;
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c27370 |
break;
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c27370 |
@@ -236,22 +240,41 @@ parse_die (bfd * abfd,
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c27370 |
xptr += 8;
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c27370 |
break;
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c27370 |
case FORM_ADDR:
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c27370 |
- if (attr == AT_low_pc)
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c27370 |
- aDieInfo->low_pc = bfd_get_32 (abfd, (bfd_byte *) xptr);
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c27370 |
- else if (attr == AT_high_pc)
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c27370 |
- aDieInfo->high_pc = bfd_get_32 (abfd, (bfd_byte *) xptr);
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c27370 |
+ if (xptr + 4 <= aDiePtrEnd)
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c27370 |
+ {
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c27370 |
+ if (attr == AT_low_pc)
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c27370 |
+ aDieInfo->low_pc = bfd_get_32 (abfd, xptr);
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c27370 |
+ else if (attr == AT_high_pc)
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c27370 |
+ aDieInfo->high_pc = bfd_get_32 (abfd, xptr);
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c27370 |
+ }
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c27370 |
xptr += 4;
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c27370 |
break;
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c27370 |
case FORM_BLOCK2:
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c27370 |
- xptr += 2 + bfd_get_16 (abfd, (bfd_byte *) xptr);
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c27370 |
+ if (xptr + 2 <= aDiePtrEnd)
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c27370 |
+ {
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c27370 |
+ block_len = bfd_get_16 (abfd, xptr);
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c27370 |
+ if (xptr + block_len > aDiePtrEnd
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c27370 |
+ || xptr + block_len < xptr)
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c27370 |
+ return FALSE;
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c27370 |
+ xptr += block_len;
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c27370 |
+ }
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c27370 |
+ xptr += 2;
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c27370 |
break;
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c27370 |
case FORM_BLOCK4:
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c27370 |
- xptr += 4 + bfd_get_32 (abfd, (bfd_byte *) xptr);
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c27370 |
+ if (xptr + 4 <= aDiePtrEnd)
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c27370 |
+ {
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c27370 |
+ block_len = bfd_get_32 (abfd, xptr);
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c27370 |
+ if (xptr + block_len > aDiePtrEnd
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c27370 |
+ || xptr + block_len < xptr)
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c27370 |
+ return FALSE;
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c27370 |
+ xptr += block_len;
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c27370 |
+ }
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c27370 |
+ xptr += 4;
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c27370 |
break;
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c27370 |
case FORM_STRING:
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c27370 |
if (attr == AT_name)
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c27370 |
aDieInfo->name = (char *) xptr;
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c27370 |
- xptr += strlen ((char *) xptr) + 1;
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c27370 |
+ xptr += strnlen ((char *) xptr, aDiePtrEnd - xptr) + 1;
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c27370 |
break;
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c27370 |
}
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c27370 |
}
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