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49857a |
--- binutils.orig/bfd/dwarf1.c 2018-05-15 17:25:27.656131299 +0100
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+++ binutils-2.27/bfd/dwarf1.c 2018-05-15 17:29:04.176057372 +0100
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@@ -208,6 +208,7 @@ parse_die (bfd * abfd,
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/* Then the attributes. */
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while (xptr < (this_die + aDieInfo->length))
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{
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+ unsigned int block_len;
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unsigned short attr;
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/* Parse the attribute based on its form. This section
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@@ -223,12 +224,15 @@ parse_die (bfd * abfd,
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break;
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case FORM_DATA4:
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case FORM_REF:
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- if (attr == AT_sibling)
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- aDieInfo->sibling = bfd_get_32 (abfd, (bfd_byte *) xptr);
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- else if (attr == AT_stmt_list)
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+ if (xptr + 4 <= aDiePtrEnd)
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{
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- aDieInfo->stmt_list_offset = bfd_get_32 (abfd, (bfd_byte *) xptr);
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- aDieInfo->has_stmt_list = 1;
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+ if (attr == AT_sibling)
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+ aDieInfo->sibling = bfd_get_32 (abfd, xptr);
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+ else if (attr == AT_stmt_list)
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+ {
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+ aDieInfo->stmt_list_offset = bfd_get_32 (abfd, xptr);
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+ aDieInfo->has_stmt_list = 1;
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+ }
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}
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xptr += 4;
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break;
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@@ -236,22 +240,41 @@ parse_die (bfd * abfd,
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xptr += 8;
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break;
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case FORM_ADDR:
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- if (attr == AT_low_pc)
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- aDieInfo->low_pc = bfd_get_32 (abfd, (bfd_byte *) xptr);
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- else if (attr == AT_high_pc)
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- aDieInfo->high_pc = bfd_get_32 (abfd, (bfd_byte *) xptr);
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+ if (xptr + 4 <= aDiePtrEnd)
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+ {
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+ if (attr == AT_low_pc)
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+ aDieInfo->low_pc = bfd_get_32 (abfd, xptr);
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+ else if (attr == AT_high_pc)
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+ aDieInfo->high_pc = bfd_get_32 (abfd, xptr);
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+ }
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xptr += 4;
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break;
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case FORM_BLOCK2:
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- xptr += 2 + bfd_get_16 (abfd, (bfd_byte *) xptr);
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+ if (xptr + 2 <= aDiePtrEnd)
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+ {
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+ block_len = bfd_get_16 (abfd, xptr);
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+ if (xptr + block_len > aDiePtrEnd
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+ || xptr + block_len < xptr)
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+ return FALSE;
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+ xptr += block_len;
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+ }
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+ xptr += 2;
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break;
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case FORM_BLOCK4:
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- xptr += 4 + bfd_get_32 (abfd, (bfd_byte *) xptr);
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+ if (xptr + 4 <= aDiePtrEnd)
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+ {
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+ block_len = bfd_get_32 (abfd, xptr);
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+ if (xptr + block_len > aDiePtrEnd
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+ || xptr + block_len < xptr)
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+ return FALSE;
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+ xptr += block_len;
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+ }
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+ xptr += 4;
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break;
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case FORM_STRING:
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if (attr == AT_name)
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aDieInfo->name = (char *) xptr;
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- xptr += strlen ((char *) xptr) + 1;
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+ xptr += strnlen ((char *) xptr, aDiePtrEnd - xptr) + 1;
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break;
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}
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}
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