net/sched: cls_flower: allocate mask dynamically in fl_change()

Recent changes (especially 05cd271fd61a ("cls_flower: Support multiple
masks per priority")) in the fl_flow_mask structure grow it and its
current size e.g. on x86_64 with defconfig is 760 bytes and more than
1024 bytes with some debug options enabled. Prior the mentioned commit
its size was 176 bytes (using defconfig on x86_64).
With regard to this fact it's reasonable to allocate this structure
dynamically in fl_change() to reduce its stack size.

- use kzalloc() instead of kcalloc()

Fixes: 05cd271fd61a ("cls_flower: Support multiple masks per priority")
Cc: Jiri Pirko <>
Cc: Paul Blakey <>
Acked-by: Jiri Pirko <>
Signed-off-by: Ivan Vecera <>
Signed-off-by: David S. Miller <>
1 file changed