Eric Pouech : dbghelp: Check correctness of type (esp. in case of unknown ones).
Alexandre Julliard
julliard at winehq.org
Fri Sep 3 16:25:28 CDT 2021
Module: wine
Branch: master
Commit: c8fede5efbbb2e64ad8c6581fecf47dc06c7916f
URL: https://source.winehq.org/git/wine.git/?a=commit;h=c8fede5efbbb2e64ad8c6581fecf47dc06c7916f
Author: Eric Pouech <eric.pouech at gmail.com>
Date: Thu Sep 2 11:22:44 2021 +0200
dbghelp: Check correctness of type (esp. in case of unknown ones).
Since with the unknown type entry, we can end up with types which don't
match the expected symt->tag, we need to check before the conversions.
Signed-off-by: Eric Pouech <eric.pouech at gmail.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>
---
dlls/dbghelp/dbghelp_private.h | 5 +++++
dlls/dbghelp/dwarf.c | 22 +++++++++++++---------
2 files changed, 18 insertions(+), 9 deletions(-)
diff --git a/dlls/dbghelp/dbghelp_private.h b/dlls/dbghelp/dbghelp_private.h
index 2b0365bc386..eb2b53e947a 100644
--- a/dlls/dbghelp/dbghelp_private.h
+++ b/dlls/dbghelp/dbghelp_private.h
@@ -151,6 +151,11 @@ struct symt_ht
struct hash_table_elt hash_elt; /* if global symbol or type */
};
+static inline BOOL symt_check_tag(const struct symt* s, enum SymTagEnum tag)
+{
+ return s && s->tag == tag;
+}
+
/* lexical tree */
struct symt_block
{
diff --git a/dlls/dbghelp/dwarf.c b/dlls/dbghelp/dwarf.c
index 1876f573cf9..ee73abdf378 100644
--- a/dlls/dbghelp/dwarf.c
+++ b/dlls/dbghelp/dwarf.c
@@ -1439,7 +1439,8 @@ static struct symt* dwarf2_parse_udt_type(dwarf2_parse_context_t* ctx,
break;
case DW_TAG_member:
/* FIXME: should I follow the sibling stuff ?? */
- dwarf2_parse_udt_member(ctx, child, (struct symt_udt*)di->symt);
+ if (symt_check_tag(di->symt, SymTagUDT))
+ dwarf2_parse_udt_member(ctx, child, (struct symt_udt*)di->symt);
break;
case DW_TAG_enumeration_type:
dwarf2_parse_enumeration_type(ctx, child);
@@ -1527,7 +1528,8 @@ static struct symt* dwarf2_parse_enumeration_type(dwarf2_parse_context_t* ctx,
switch (child->abbrev->tag)
{
case DW_TAG_enumerator:
- dwarf2_parse_enumerator(ctx, child, (struct symt_enum*)di->symt);
+ if (symt_check_tag(di->symt, SymTagEnum))
+ dwarf2_parse_enumerator(ctx, child, (struct symt_enum*)di->symt);
break;
default:
FIXME("Unhandled Tag type 0x%lx at %s, for %s\n",
@@ -1683,7 +1685,7 @@ static void dwarf2_parse_variable(dwarf2_subprogram_t* subpgm,
WARN("dropping global variable %s which has been optimized away\n", debugstr_a(name.u.string));
}
}
- if (is_pmt && subpgm->func && subpgm->func->type)
+ if (is_pmt && subpgm->func && symt_check_tag(subpgm->func->type, SymTagFunctionType))
symt_add_function_signature_parameter(subpgm->ctx->module,
(struct symt_function_signature*)subpgm->func->type,
param_type);
@@ -2129,10 +2131,12 @@ static void dwarf2_set_line_number(struct module* module, ULONG_PTR address,
TRACE("%s %lx %s %u\n",
debugstr_w(module->module.ModuleName), address, debugstr_a(source_get(module, *psrc)), line);
- if (!(symt = symt_find_nearest(module, address)) ||
- symt->symt.tag != SymTagFunction) return;
- func = (struct symt_function*)symt;
- symt_add_func_line(module, func, *psrc, line, address - func->address);
+ symt = symt_find_nearest(module, address);
+ if (symt && symt_check_tag(&symt->symt, SymTagFunction))
+ {
+ func = (struct symt_function*)symt;
+ symt_add_func_line(module, func, *psrc, line, address - func->address);
+ }
}
static BOOL dwarf2_parse_line_numbers(const dwarf2_section_t* sections,
@@ -2466,7 +2470,7 @@ static enum location_error loc_compute_frame(struct process* pcs,
for (i=0; i<vector_length(&func->vchildren); i++)
{
psym = vector_at(&func->vchildren, i);
- if ((*psym)->tag == SymTagCustom)
+ if (psym && symt_check_tag(*psym, SymTagCustom))
{
pframe = &((struct symt_hierarchy_point*)*psym)->loc;
@@ -3279,7 +3283,7 @@ static void dwarf2_location_compute(struct process* pcs,
int err;
dwarf2_traverse_context_t lctx;
- if (!func->container || func->container->tag != SymTagCompiland)
+ if (!func || !symt_check_tag(func->container, SymTagCompiland))
{
WARN("We'd expect function %s's container to exist and be a compiland\n", debugstr_a(func->hash_elt.name));
err = loc_err_internal;
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