gallium/util: Make u_prims_for_vertices() safe

Let us avoid trapping in hardware from a SIGFPE and instead
assert on a zero divisor.

Hint: This can occur if a PIPE_PRIM_? is not handled in
      u_prim_vertex_count() that results in ' info ' not
      being initialized in the expected manner.

Further, we also fix a possibly NULL pointer dereference
from ' info ' being NULL from a u_prim_vertex_count() call.

Signed-off-by: Edward O'Callaghan <[email protected]>
Signed-off-by: Marek Olšák <[email protected]>

1 files changed, 3 insertions, 0 deletions

diff --git a/src/gallium/auxiliary/util/u_prim.h b/src/gallium/auxiliary/util/u_prim.h
index 366801545ed..a09c315cc0a 100644
--- a/src/gallium/auxiliary/util/u_prim.h
+++ b/src/gallium/auxiliary/util/u_prim.h
@@ -145,6 +145,9 @@ u_prims_for_vertices(unsigned prim, unsigned num)
 {
    const struct u_prim_vertex_count *info = u_prim_vertex_count(prim);
 
+   assert(info);
+   assert(info->incr != 0);
+
    if (num < info->min)
       return 0;