Make sure that backends array has anything apart from the sentinel NULL value. Signed-off-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx> --- drivers/block/zram/zcomp.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/drivers/block/zram/zcomp.c b/drivers/block/zram/zcomp.c index 9fc5477a6259..fdf06fc6b364 100644 --- a/drivers/block/zram/zcomp.c +++ b/drivers/block/zram/zcomp.c @@ -205,6 +205,14 @@ struct zcomp *zcomp_create(const char *alg) struct zcomp *comp; int error; + /* + * The backends array has a sentinel NULL value, so the minimum + * size is 1. In order to be valid the array, apart from the + * sentinel NULL element, should have at least one compression + * backend selected. + */ + BUILD_BUG_ON(ARRAY_SIZE(backends) <= 1); + comp = kzalloc(sizeof(struct zcomp), GFP_KERNEL); if (!comp) return ERR_PTR(-ENOMEM); -- 2.45.0.rc1.225.g2a3ae87e7f-goog
