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net: hsr: check for return value of skb_put_padto()

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skb_put_padto() can fail. So check for return type and return NULL
for skb. Caller checks for skb and acts correctly if it is NULL.

Fixes: 6d6148bc78 ("net: hsr: fix incorrect lsdu size in the tag of HSR frames for small frames")

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Murali Karicheri 2020-07-20 12:43:27 -04:00 committed by David S. Miller
parent 34b85adad8
commit 5d93518e06
1 changed files with 11 additions and 6 deletions
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17
net/hsr/hsr_forward.c
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@ -120,15 +120,17 @@ static struct sk_buff *frame_get_stripped_skb(struct hsr_frame_info *frame,
return skb_clone(frame->skb_std, GFP_ATOMIC);
}
static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
struct hsr_port *port, u8 proto_version)
static struct sk_buff *hsr_fill_tag(struct sk_buff *skb,
struct hsr_frame_info *frame,
struct hsr_port *port, u8 proto_version)
{
struct hsr_ethhdr *hsr_ethhdr;
int lane_id;
int lsdu_size;
/* pad to minimum packet size which is 60 + 6 (HSR tag) */
skb_put_padto(skb, ETH_ZLEN + HSR_HLEN);
if (skb_put_padto(skb, ETH_ZLEN + HSR_HLEN))
return NULL;
if (port->type == HSR_PT_SLAVE_A)
lane_id = 0;
@ -147,6 +149,8 @@ static void hsr_fill_tag(struct sk_buff *skb, struct hsr_frame_info *frame,
hsr_ethhdr->hsr_tag.encap_proto = hsr_ethhdr->ethhdr.h_proto;
hsr_ethhdr->ethhdr.h_proto = htons(proto_version ?
ETH_P_HSR : ETH_P_PRP);
return skb;
}
static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
@ -175,9 +179,10 @@ static struct sk_buff *create_tagged_skb(struct sk_buff *skb_o,
memmove(dst, src, movelen);
skb_reset_mac_header(skb);
hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
return skb;
/* skb_put_padto free skb on error and hsr_fill_tag returns NULL in
* that case
*/
return hsr_fill_tag(skb, frame, port, port->hsr->prot_version);
}
/* If the original frame was an HSR tagged frame, just clone it to be sent