net/ipv5/tcp: use vma_lookup() in tcp_zerocopy_receive()

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.

Link: https://lkml.kernel.org/r/20210521174745.2219620-13-Liam.Howlett@Oracle.com
Signed-off-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Laurent Dufour <ldufour@linux.ibm.com>
Acked-by: David Hildenbrand <david@redhat.com>
Acked-by: Davidlohr Bueso <dbueso@suse.de>
Cc: David Miller <davem@davemloft.net>
Cc: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

diff --git a/net/ipv4/tcp.c b/net/ipv4/tcp.c
index f1c1f9e..64bf179 100644 (file)
--- a/net/ipv4/tcp.c
+++ b/net/ipv4/tcp.c
@@ -2095,8 +2095,8 @@ static int tcp_zerocopy_receive(struct sock *sk,
 
        mmap_read_lock(current->mm);
 
-       vma = find_vma(current->mm, address);
-       if (!vma || vma->vm_start > address || vma->vm_ops != &tcp_vm_ops) {
+       vma = vma_lookup(current->mm, address);
+       if (!vma || vma->vm_ops != &tcp_vm_ops) {
                mmap_read_unlock(current->mm);
                return -EINVAL;
        }