[PATCH net] tun: fix return value when the number of iovs exceeds MAX_SKB_FRAGS

[wangyunjian]

From: Yunjian Wang <wangyunj...@huawei.com>

Currently the tun_napi_alloc_frags() function returns -ENOMEM when the
number of iovs exceeds MAX_SKB_FRAGS + 1. However this is inappropriate,
we should use -EMSGSIZE instead of -ENOMEM.

Fixes: 90e33d459407 ("tun: enable napi_gro_frags() for TUN/TAP driver")
Signed-off-by: Yunjian Wang <wangyunj...@huawei.com>
---
 drivers/net/tun.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 2dc1988a8973..15c6dd7fb04c 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1365,7 +1365,7 @@ static struct sk_buff *tun_napi_alloc_frags(struct 
tun_file *tfile,
        int i;
 
        if (it->nr_segs > MAX_SKB_FRAGS + 1)
-               return ERR_PTR(-ENOMEM);
+               return ERR_PTR(-EMSGSIZE);
 
        local_bh_disable();
        skb = napi_get_frags(&tfile->napi);
-- 
2.23.0