sna/gen[23]: We need to check the batch before doing an inline flush

A missing check before emitting a dword into the batch opened up the
possibility of overflowing the batch and corrupting our state.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

1 files changed, 1 insertions, 1 deletions

diff --git a/src/sna/sna_render_inline.h b/src/sna/sna_render_inline.h
index daa8f6fe..758833ed 100644
--- a/src/sna/sna_render_inline.h
+++ b/src/sna/sna_render_inline.h
@@ -52,7 +52,7 @@ static inline int batch_space(struct sna *sna)
 
 static inline void batch_emit(struct sna *sna, uint32_t dword)
 {
-	assert(sna->kgem.nbatch < sna->kgem.surface);
+	assert(sna->kgem.nbatch + KGEM_BATCH_RESERVED < sna->kgem.surface);
 	sna->kgem.batch[sna->kgem.nbatch++] = dword;
 }