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dbghelp/dwarf: Validate that a string is in the section boundary before using it. 

Signed-off-by: Eric Pouech <eric.pouech@gmail.com>
Signed-off-by: Alexandre Julliard <julliard@winehq.org>
This commit is contained in:
Eric Pouech 2021-09-11 10:59:30 +02:00 committed by Alexandre Julliard
parent 23f0ebbca6
commit 3111daa222
1 changed files with 13 additions and 3 deletions
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16
dlls/dbghelp/dwarf.c
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@ -601,9 +601,19 @@ static BOOL dwarf2_fill_attr(const dwarf2_parse_context_t* ctx,
break;
case DW_FORM_strp:
attr->u.string = (const char*)ctx->sections[section_string].address +
dwarf2_get_addr(data, ctx->head.offset_size);
TRACE("strp<%s>\n", debugstr_a(attr->u.string));
{
ULONG_PTR ofs = dwarf2_get_addr(data, ctx->head.offset_size);
if (ofs >= ctx->sections[section_string].size)
{
ERR("Out of bounds string offset (%08lx)\n", ofs);
attr->u.string = "<<outofbounds-strp>>";
}
else
{
attr->u.string = (const char*)ctx->sections[section_string].address + ofs;
TRACE("strp<%s>\n", debugstr_a(attr->u.string));
}
}
break;
case DW_FORM_block: