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author | DENG Qingfang <dqfext@gmail.com> | 2021-02-28 20:08:23 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-03-17 19:06:13 +0300 |
commit | 68277f69a8734a444a05dce9f78ce79c1225d08d (patch) | |
tree | 4a7d73a62e9312bcdc0c0714e871d2afb781d511 /net/dsa | |
parent | 389055e7b97048c7ecd6066cdac2c703bae493bc (diff) | |
download | linux-68277f69a8734a444a05dce9f78ce79c1225d08d.tar.xz |
net: dsa: tag_rtl4_a: fix egress tags
commit 9eb8bc593a5eed167dac2029abef343854c5ba75 upstream.
Commit 86dd9868b878 has several issues, but was accepted too soon
before anyone could take a look.
- Double free. dsa_slave_xmit() will free the skb if the xmit function
returns NULL, but the skb is already freed by eth_skb_pad(). Use
__skb_put_padto() to avoid that.
- Unnecessary allocation. It has been done by DSA core since commit
a3b0b6479700.
- A u16 pointer points to skb data. It should be __be16 for network
byte order.
- Typo in comments. "numer" -> "number".
Fixes: 86dd9868b878 ("net: dsa: tag_rtl4_a: Support also egress tags")
Signed-off-by: DENG Qingfang <dqfext@gmail.com>
Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'net/dsa')
-rw-r--r-- | net/dsa/tag_rtl4_a.c | 12 |
1 files changed, 5 insertions, 7 deletions
diff --git a/net/dsa/tag_rtl4_a.c b/net/dsa/tag_rtl4_a.c index c17d39b4a1a0..e9176475bac8 100644 --- a/net/dsa/tag_rtl4_a.c +++ b/net/dsa/tag_rtl4_a.c @@ -35,14 +35,12 @@ static struct sk_buff *rtl4a_tag_xmit(struct sk_buff *skb, struct net_device *dev) { struct dsa_port *dp = dsa_slave_to_port(dev); + __be16 *p; u8 *tag; - u16 *p; u16 out; /* Pad out to at least 60 bytes */ - if (unlikely(eth_skb_pad(skb))) - return NULL; - if (skb_cow_head(skb, RTL4_A_HDR_LEN) < 0) + if (unlikely(__skb_put_padto(skb, ETH_ZLEN, false))) return NULL; netdev_dbg(dev, "add realtek tag to package to port %d\n", @@ -53,13 +51,13 @@ static struct sk_buff *rtl4a_tag_xmit(struct sk_buff *skb, tag = skb->data + 2 * ETH_ALEN; /* Set Ethertype */ - p = (u16 *)tag; + p = (__be16 *)tag; *p = htons(RTL4_A_ETHERTYPE); out = (RTL4_A_PROTOCOL_RTL8366RB << 12) | (2 << 8); - /* The lower bits is the port numer */ + /* The lower bits is the port number */ out |= (u8)dp->index; - p = (u16 *)(tag + 2); + p = (__be16 *)(tag + 2); *p = htons(out); return skb; |