kernel/events/uprobes: Use vma_lookup() in find_active_uprobe()

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@Oracle.com>

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 6addc97803198d5f80d7b77a8f65b8aaef53dd9d..907d4ee00cb2f29961476ba54ba18ea01d90d45f 100644 (file)
--- 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);