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Diffstat (limited to 'mesalib/src/mesa/main')
-rw-r--r--mesalib/src/mesa/main/bufferobj.c24
1 files changed, 23 insertions, 1 deletions
diff --git a/mesalib/src/mesa/main/bufferobj.c b/mesalib/src/mesa/main/bufferobj.c
index c453f9c85..a30340174 100644
--- a/mesalib/src/mesa/main/bufferobj.c
+++ b/mesalib/src/mesa/main/bufferobj.c
@@ -1004,6 +1004,12 @@ _mesa_MapBufferARB(GLenum target, GLenum access)
return NULL;
}
+ if (!bufObj->Size) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY,
+ "glMapBuffer(buffer size = 0)");
+ return NULL;
+ }
+
ASSERT(ctx->Driver.MapBufferRange);
map = ctx->Driver.MapBufferRange(ctx, 0, bufObj->Size, accessFlags, bufObj);
if (!map) {
@@ -1410,7 +1416,23 @@ _mesa_MapBufferRange(GLenum target, GLintptr offset, GLsizeiptr length,
"glMapBufferRange(buffer already mapped)");
return NULL;
}
-
+
+ if (!bufObj->Size) {
+ _mesa_error(ctx, GL_OUT_OF_MEMORY,
+ "glMapBufferRange(buffer size = 0)");
+ return NULL;
+ }
+
+ /* Mapping zero bytes should return a non-null pointer. */
+ if (!length) {
+ static long dummy = 0;
+ bufObj->Pointer = &dummy;
+ bufObj->Length = length;
+ bufObj->Offset = offset;
+ bufObj->AccessFlags = access;
+ return bufObj->Pointer;
+ }
+
ASSERT(ctx->Driver.MapBufferRange);
map = ctx->Driver.MapBufferRange(ctx, offset, length, access, bufObj);
if (!map) {