diff mbox series

[116/192] net/ipv5/tcp: use vma_lookup() in tcp_zerocopy_receive()

Message ID 20210629023923.Pi_mCDAdS%akpm@linux-foundation.org (mailing list archive)
State New
Headers show
Series [001/192] mm/gup: fix try_grab_compound_head() race with split_huge_page() | expand

Commit Message

Andrew Morton June 29, 2021, 2:39 a.m. UTC
From: Liam Howlett <liam.howlett@oracle.com>
Subject: 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>
---

 net/ipv4/tcp.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

--- a/net/ipv4/tcp.c~net-ipv5-tcp-use-vma_lookup-in-tcp_zerocopy_receive
+++ a/net/ipv4/tcp.c
@@ -2095,8 +2095,8 @@  static int tcp_zerocopy_receive(struct s
 
 	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;
 	}