Matteo Bruni : vkd3d-shader/hlsl: Handle over/underflow when parsing integer literals.

[Alexandre Julliard]

Module: vkd3d
Branch: master
Commit: 228f7ab5cd2371bd202b4d06f40fc47c48f4e0e5
URL:    https://source.winehq.org/git/vkd3d.git/?a=commit;h=228f7ab5cd2371bd202b4d06...

Author: Matteo Bruni 
Date:   Wed May 11 16:39:08 2022 +0200

vkd3d-shader/hlsl: Handle over/underflow when parsing integer literals.

Signed-off-by: Matteo Bruni 
Signed-off-by: Henri Verbeet 
Signed-off-by: Giovanni Mascellani 
Signed-off-by: Zebediah Figura 
Signed-off-by: Alexandre Julliard

---

libs/vkd3d-shader/hlsl.l                 |  6 +++---
 libs/vkd3d-shader/preproc.y              | 34 +-------------------------------
 libs/vkd3d-shader/vkd3d_shader_main.c    | 32 ++++++++++++++++++++++++++++++
 libs/vkd3d-shader/vkd3d_shader_private.h |  2 ++
 4 files changed, 38 insertions(+), 36 deletions(-)

diff --git a/libs/vkd3d-shader/hlsl.l b/libs/vkd3d-shader/hlsl.l
index 267c8c30..ff7b712f 100644
--- a/libs/vkd3d-shader/hlsl.l
+++ b/libs/vkd3d-shader/hlsl.l
@@ -197,15 +197,15 @@ row_major               {return KW_ROW_MAJOR;           }
                             return C_FLOAT;
                         }
 0x[0-9a-fA-F]+          {
-                            sscanf(yytext, "0x%x", &yylval->intval);
+                            yylval->intval = vkd3d_parse_integer(yytext);
                             return C_INTEGER;
                         }
 0[0-7]+                 {
-                            sscanf(yytext, "0%o", &yylval->intval);
+                            yylval->intval = vkd3d_parse_integer(yytext);
                             return C_INTEGER;
                         }
 [0-9]+                  {
-                            yylval->intval = (atoi(yytext));
+                            yylval->intval = vkd3d_parse_integer(yytext);
                             return C_INTEGER;
                         }

diff --git a/libs/vkd3d-shader/preproc.y b/libs/vkd3d-shader/preproc.y
index 3f02ac03..009c35ff 100644
--- a/libs/vkd3d-shader/preproc.y
+++ b/libs/vkd3d-shader/preproc.y
@@ -165,38 +165,6 @@ static bool preproc_push_if(struct preproc_ctx *ctx, bool condition)
     return true;
 }

-static int char_to_int(char c)
-{
-    if ('0' <= c && c <= '9')
-        return c - '0';
-    if ('A' <= c && c <= 'F')
-        return c - 'A' + 10;
-    if ('a' <= c && c <= 'f')
-        return c - 'a' + 10;
-    return -1;
-}
-
-static uint32_t preproc_parse_integer(const char *s)
-{
-    uint32_t base = 10, ret = 0;
-    int digit;
-
-    if (*s == '0')
-    {
-        base = 8;
-        ++s;
-        if (*s == 'x' || *s == 'X')
-        {
-            base = 16;
-            ++s;
-        }
-    }
-
-    while ((digit = char_to_int(*s++)) >= 0)
-        ret = ret * base + (uint32_t)digit;
-    return ret;
-}
-
 static int default_open_include(const char *filename, bool local,
         const char *parent_data, void *context, struct vkd3d_shader_code *out)
 {
@@ -691,7 +659,7 @@ directive
 primary_expr
     : T_INTEGER
         {
-            $$ = preproc_parse_integer($1);
+            $$ = vkd3d_parse_integer($1);
             vkd3d_free($1);
         }
     | T_IDENTIFIER
diff --git a/libs/vkd3d-shader/vkd3d_shader_main.c b/libs/vkd3d-shader/vkd3d_shader_main.c
index 62baf17f..6fd32435 100644
--- a/libs/vkd3d-shader/vkd3d_shader_main.c
+++ b/libs/vkd3d-shader/vkd3d_shader_main.c
@@ -24,6 +24,38 @@

VKD3D_DEBUG_ENV_NAME("VKD3D_SHADER_DEBUG");

+static inline int char_to_int(char c)
+{
+    if ('0' <= c && c <= '9')
+        return c - '0';
+    if ('A' <= c && c <= 'F')
+        return c - 'A' + 10;
+    if ('a' <= c && c <= 'f')
+        return c - 'a' + 10;
+    return -1;
+}
+
+uint32_t vkd3d_parse_integer(const char *s)
+{
+    uint32_t base = 10, ret = 0;
+    int digit;
+
+    if (*s == '0')
+    {
+        base = 8;
+        ++s;
+        if (*s == 'x' || *s == 'X')
+        {
+            base = 16;
+            ++s;
+        }
+    }
+
+    while ((digit = char_to_int(*s++)) >= 0)
+        ret = ret * base + (uint32_t)digit;
+    return ret;
+}
+
 void vkd3d_string_buffer_init(struct vkd3d_string_buffer *buffer)
 {
     buffer->buffer_size = 16;
diff --git a/libs/vkd3d-shader/vkd3d_shader_private.h b/libs/vkd3d-shader/vkd3d_shader_private.h
index 29e178cc..8bde5523 100644
--- a/libs/vkd3d-shader/vkd3d_shader_private.h
+++ b/libs/vkd3d-shader/vkd3d_shader_private.h
@@ -1035,6 +1035,8 @@ static inline size_t bytecode_get_size(struct vkd3d_bytecode_buffer *buffer)
     return buffer->size;
 }

+uint32_t vkd3d_parse_integer(const char *s);
+
 struct vkd3d_shader_message_context
 {
     enum vkd3d_shader_log_level log_level;