As per the coding standards, in the event of an abnormal condition that should not occur under normal circumstances, the kernel should attempt recovery and proceed with execution, rather than halting the machine. Specifically, in the alloc_vmap_area() function, use a simple if() instead of using BUG_ON() halting the machine. Co-Developed-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx> Co-Developed-by: Jeungwoo Yoo <casionwoo@xxxxxxxxx> Co-Developed-by: Sangyun Kim <sangyun.kim@xxxxxxxxx> Signed-off-by: Hyunmin Lee <hn.min.lee@xxxxxxxxx> Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun@xxxxxxxxx> Signed-off-by: Jeungwoo Yoo <casionwoo@xxxxxxxxx> Signed-off-by: Sangyun Kim <sangyun.kim@xxxxxxxxx> Cc: Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx> --- v1->v2 : Add commit description v2->v3 : Change WARN_ON() to if() --- mm/vmalloc.c | 11 ++++++++--- 1 file changed, 8 insertions(+), 3 deletions(-) diff --git a/mm/vmalloc.c b/mm/vmalloc.c index 74afa2208558..52a346bc02a1 100644 --- a/mm/vmalloc.c +++ b/mm/vmalloc.c @@ -1587,9 +1587,14 @@ static struct vmap_area *alloc_vmap_area(unsigned long size, int purged = 0; int ret; - BUG_ON(!size); - BUG_ON(offset_in_page(size)); - BUG_ON(!is_power_of_2(align)); + if (unlikely(!size)) + return ERR_PTR(-EINVAL); + + if (unlikely(offset_in_page(size))) + return ERR_PTR(-EINVAL); + + if (unlikely(!is_power_of_2(align))) + return ERR_PTR(-EINVAL); if (unlikely(!vmap_initialized)) return ERR_PTR(-EBUSY); -- 2.25.1
