1 files changed, 6 insertions, 2 deletions
diff --git a/mm/mmap.c b/mm/mmap.c
index 1ae21d6..f681e18 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -1367,9 +1367,13 @@ SYSCALL_DEFINE6(mmap_pgoff, unsigned long, addr, unsigned long, len,
 			len = ALIGN(len, huge_page_size(hstate_file(file)));
 	} else if (flags & MAP_HUGETLB) {
 		struct user_struct *user = NULL;
+		struct hstate *hs = hstate_sizelog((flags >> MAP_HUGE_SHIFT) &
+						   SHM_HUGE_MASK);
 
-		len = ALIGN(len, huge_page_size(hstate_sizelog(
-			(flags >> MAP_HUGE_SHIFT) & MAP_HUGE_MASK)));
+		if (!hs)
+			return -EINVAL;
+
+		len = ALIGN(len, huge_page_size(hs));
 		/*
 		 * VM_NORESERVE is used because the reservations will be
 		 * taken when vm_ops->mmap() is called