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--- binutils.orig/bfd/dwarf2.c 2018-05-15 17:25:27.661131255 +0100
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+++ binutils-2.27/bfd/dwarf2.c 2018-05-15 17:38:16.900598281 +0100
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@@ -606,14 +606,24 @@ read_8_bytes (bfd *abfd, bfd_byte *buf,
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}
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static bfd_byte *
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-read_n_bytes (bfd *abfd ATTRIBUTE_UNUSED,
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- bfd_byte *buf,
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- bfd_byte *end,
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- unsigned int size ATTRIBUTE_UNUSED)
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+read_n_bytes (bfd_byte * buf,
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+ bfd_byte * end,
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+ struct dwarf_block * block)
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{
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- if (buf + size > end)
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- return NULL;
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- return buf;
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+ unsigned int size = block->size;
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+ bfd_byte * block_end = buf + size;
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+
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+ if (block_end > end || block_end < buf)
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+ {
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+ block->data = NULL;
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+ block->size = 0;
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+ return end;
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+ }
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+ else
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+ {
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+ block->data = buf;
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+ return block_end;
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+ }
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}
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/* Scans a NUL terminated string starting at BUF, returning a pointer to it.
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@@ -1053,8 +1063,7 @@ read_attribute_value (struct attribute *
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return NULL;
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blk->size = read_2_bytes (abfd, info_ptr, info_ptr_end);
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info_ptr += 2;
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- blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
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- info_ptr += blk->size;
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+ info_ptr = read_n_bytes (info_ptr, info_ptr_end, blk);
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attr->u.blk = blk;
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break;
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case DW_FORM_block4:
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@@ -1064,8 +1073,7 @@ read_attribute_value (struct attribute *
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return NULL;
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blk->size = read_4_bytes (abfd, info_ptr, info_ptr_end);
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info_ptr += 4;
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- blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
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- info_ptr += blk->size;
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+ info_ptr = read_n_bytes (info_ptr, info_ptr_end, blk);
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attr->u.blk = blk;
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break;
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case DW_FORM_data2:
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@@ -1100,8 +1108,7 @@ read_attribute_value (struct attribute *
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return NULL;
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blk->size = safe_read_leb128 (abfd, info_ptr, &bytes_read, FALSE, info_ptr_end);
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info_ptr += bytes_read;
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- blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
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- info_ptr += blk->size;
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+ info_ptr = read_n_bytes (info_ptr, info_ptr_end, blk);
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attr->u.blk = blk;
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break;
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case DW_FORM_block1:
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@@ -1111,8 +1118,7 @@ read_attribute_value (struct attribute *
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return NULL;
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blk->size = read_1_byte (abfd, info_ptr, info_ptr_end);
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info_ptr += 1;
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- blk->data = read_n_bytes (abfd, info_ptr, info_ptr_end, blk->size);
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- info_ptr += blk->size;
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+ info_ptr = read_n_bytes (info_ptr, info_ptr_end, blk);
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attr->u.blk = blk;
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break;
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case DW_FORM_data1:
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