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authorChristoph Hellwig <hch@lst.de>2020-07-28 19:38:36 +0300
committerDavid S. Miller <davem@davemloft.net>2020-07-28 23:43:40 +0300
commita31edb2059ed4e498f9aa8230c734b59d0ad797a (patch)
tree050f16554295c22db098bb4e81021e21d2718c5f /net/ipv4
parentd3c48151512922dd35f1f393b30b9138e4441d14 (diff)
downloadlinux-a31edb2059ed4e498f9aa8230c734b59d0ad797a.tar.xz
net: improve the user pointer check in init_user_sockptr
Make sure not just the pointer itself but the whole range lies in the user address space. For that pass the length and then use the access_ok helper to do the check. Fixes: 6d04fe15f78a ("net: optimize the sockptr_t for unified kernel/user address spaces") Reported-by: David Laight <David.Laight@ACULAB.COM> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
-rw-r--r--net/ipv4/bpfilter/sockopt.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/ipv4/bpfilter/sockopt.c b/net/ipv4/bpfilter/sockopt.c
index 94f18d2352d0..545b2640f019 100644
--- a/net/ipv4/bpfilter/sockopt.c
+++ b/net/ipv4/bpfilter/sockopt.c
@@ -65,7 +65,7 @@ int bpfilter_ip_get_sockopt(struct sock *sk, int optname,
if (get_user(len, optlen))
return -EFAULT;
- err = init_user_sockptr(&optval, user_optval);
+ err = init_user_sockptr(&optval, user_optval, len);
if (err)
return err;
return bpfilter_mbox_request(sk, optname, optval, len, false);