[Mesa-dev] [PATCH 1/2] mesa: Make glDebugMessageInsert deal with negative length for all types.

[Kenneth Graunke]

>From the KHR_debug spec, section 5.5.5 (Externally Generated Messages):

   "If <length> is negative, it is implied that <buf> contains a null
    terminated string. The error INVALID_VALUE will be generated if the
    number of characters in <buf>, excluding the null terminator when
    <length> is negative, is not less than the value of
    MAX_DEBUG_MESSAGE_LENGTH."

This indicates that length should be set to strlen for all types, not
just GL_DEBUG_TYPE_MARKER.  We want it to be after validate_length()
so we still generate appropriate errors.

Fixes crashes from uncaught std::string exceptions in many
dEQP-GLES31.functional.debug.error_filters.* tests.

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
---
 src/mesa/main/debug_output.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/mesa/main/debug_output.c b/src/mesa/main/debug_output.c
index 74be855..001f63e 100644
--- a/src/mesa/main/debug_output.c
+++ b/src/mesa/main/debug_output.c
@@ -1009,15 +1009,16 @@ _mesa_DebugMessageInsert(GLenum source, GLenum type, GLuint id,
    if (!validate_length(ctx, callerstr, length, buf))
       return; /* GL_INVALID_VALUE */
 
+   /* if length not specified, string will be null terminated: */
+   if (length < 0)
+      length = strlen(buf);
+
    _mesa_log_msg(ctx, gl_enum_to_debug_source(source),
                  gl_enum_to_debug_type(type), id,
                  gl_enum_to_debug_severity(severity),
                  length, buf);
 
    if (type == GL_DEBUG_TYPE_MARKER && ctx->Driver.EmitStringMarker) {
-      /* if length not specified, string will be null terminated: */
-      if (length < 0)
-         length = strlen(buf);
       ctx->Driver.EmitStringMarker(ctx, buf, length);
    }
 }
-- 
2.7.4