[PATCH v2 16/22] kernel/events/uprobes: Use vma_lookup() in find_active_uprobe()

[Liam Howlett]

Use vma_lookup() to find the VMA at a specific address.  As vma_lookup()
will return NULL if the address is not within any VMA, the start address
no longer needs to be validated.

Signed-off-by: Liam R. Howlett <Liam.Howlett@xxxxxxxxxx>
Reviewed-by: Laurent Dufour <ldufour@xxxxxxxxxxxxx>
Acked-by: David Hildenbrand <david@xxxxxxxxxx>
Acked-by: Davidlohr Bueso <dbueso@xxxxxxx>
---
 kernel/events/uprobes.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 6addc9780319..907d4ee00cb2 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -2046,8 +2046,8 @@ static struct uprobe *find_active_uprobe(unsigned long bp_vaddr, int *is_swbp)
 	struct vm_area_struct *vma;
 
 	mmap_read_lock(mm);
-	vma = find_vma(mm, bp_vaddr);
-	if (vma && vma->vm_start <= bp_vaddr) {
+	vma = vma_lookup(mm, bp_vaddr);
+	if (vma) {
 		if (valid_vma(vma, false)) {
 			struct inode *inode = file_inode(vma->vm_file);
 			loff_t offset = vaddr_to_offset(vma, bp_vaddr);
-- 
2.30.2