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| author | Willem de Bruijn <willemb@google.com> | 2018-12-08 14:22:46 +0300 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-12-08 23:26:20 +0300 |
| commit | 97ef7b4c5501b081c6144a08bba6d87baf69b6e5 (patch) | |
| tree | 0162a188876cd854112e5416d63f79c95721bd46 /net/ipv4 | |
| parent | 83af01ba1c2d38d3075b38af2a2116eb1ebe67e6 (diff) | |
| download | linux-97ef7b4c5501b081c6144a08bba6d87baf69b6e5.tar.xz | |
ip: silence udp zerocopy smatch false positive
extra_uref is used in __ip(6)_append_data only if uarg is set.
Smatch sees that the variable is passed to sock_zerocopy_put_abort.
This function accesses it only when uarg is set, but smatch cannot
infer this.
Make this dependency explicit.
Fixes: 52900d22288e ("udp: elide zerocopy operation in hot path")
Signed-off-by: Willem de Bruijn <willemb@google.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/ipv4')
| -rw-r--r-- | net/ipv4/ip_output.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/net/ipv4/ip_output.c b/net/ipv4/ip_output.c index 78f028bdad30..ab6618036afe 100644 --- a/net/ipv4/ip_output.c +++ b/net/ipv4/ip_output.c @@ -1130,7 +1130,8 @@ alloc_new_skb: error_efault: err = -EFAULT; error: - sock_zerocopy_put_abort(uarg, extra_uref); + if (uarg) + sock_zerocopy_put_abort(uarg, extra_uref); cork->length -= length; IP_INC_STATS(sock_net(sk), IPSTATS_MIB_OUTDISCARDS); refcount_add(wmem_alloc_delta, &sk->sk_wmem_alloc); |