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RDMA/cxgb4: Fix null pointer dereference on alloc_skb failure 

Currently if alloc_skb fails to allocate the skb a null skb is passed to
t4_set_arp_err_handler and this ends up dereferencing the null skb.  Avoid
the NULL pointer dereference by checking for a NULL skb and returning
early.

Addresses-Coverity: ("Dereference null return")
Fixes: b38a0ad8ec ("RDMA/cxgb4: Set arp error handler for PASS_ACCEPT_RPL messages")
Signed-off-by: Colin Ian King <colin.king@canonical.com>
Acked-by: Potnuri Bharat Teja <bharat@chelsio.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Colin Ian King 2019-04-13 17:00:26 +01:00 committed by Jason Gunthorpe
parent 1db86318c4
commit a6d2a5a92e
1 changed files with 2 additions and 0 deletions
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2
drivers/infiniband/hw/cxgb4/cm.c
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@ -460,6 +460,8 @@ static struct sk_buff *get_skb(struct sk_buff *skb, int len, gfp_t gfp)
skb_reset_transport_header(skb);
} else {
skb = alloc_skb(len, gfp);
if (!skb)
return NULL;
}
t4_set_arp_err_handler(skb, NULL, NULL);
return skb;