[PATCH v4 tip/perf/core 3/4] uprobes: simplify find_active_uprobe_rcu() VMA checks

[Andrii Nakryiko]

At the point where find_active_uprobe_rcu() is used we know that VMA in
question has triggered software breakpoint, so we don't need to validate
vma->vm_flags. Keep only vma->vm_file NULL check.

Acked-by: Oleg Nesterov <o...@redhat.com>
Suggested-by: Oleg Nesterov <o...@redhat.com>
Signed-off-by: Andrii Nakryiko <and...@kernel.org>
---
 kernel/events/uprobes.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/events/uprobes.c b/kernel/events/uprobes.c
index 4ef4b51776eb..290c445768fa 100644
--- a/kernel/events/uprobes.c
+++ b/kernel/events/uprobes.c
@@ -2084,7 +2084,7 @@ static struct uprobe *find_active_uprobe_rcu(unsigned 
long bp_vaddr, int *is_swb
        mmap_read_lock(mm);
        vma = vma_lookup(mm, bp_vaddr);
        if (vma) {
-               if (valid_vma(vma, false)) {
+               if (vma->vm_file) {
                        struct inode *inode = file_inode(vma->vm_file);
                        loff_t offset = vaddr_to_offset(vma, bp_vaddr);
 
-- 
2.43.5