From: Liam R. Howlett <Liam.Howlett@Oracle.com>
Date: Fri, 18 Jun 2021 00:31:19 +0000 (-0400)
Subject: remap_file_pages: Use vma_lookup() instead of find_vma()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=cab55442e8844e79a8a2630edcc6cf31432e2301;p=users%2Fjedix%2Flinux-maple.git

remap_file_pages: Use vma_lookup() instead of find_vma()

Using vma_lookup() verifies the start address is contained in the found vma.
This results in easier to read code.

Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
---

diff --git a/mm/mmap.c b/mm/mmap.c
index ca54d36d203a..1e6fd4b2877e 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2992,14 +2992,11 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
 	if (mmap_write_lock_killable(mm))
 		return -EINTR;
 
-	vma = find_vma(mm, start);
+	vma = vma_lookup(mm, start);
 
 	if (!vma || !(vma->vm_flags & VM_SHARED))
 		goto out;
 
-	if (start < vma->vm_start)
-		goto out;
-
 	if (start + size > vma->vm_end) {
 		struct vm_area_struct *next;