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Date: Wed, 4 Nov 2015 09:45:04 +0800
From: Ying Xue <ying.xue@...driver.com>
To: Stephen Hemminger <stephen@...workplumber.org>,
Jon Maloy <jon.maloy@...csson.com>
CC: <netdev@...r.kernel.org>
Subject: Re: Fw: New Defects reported by Coverity Scan for Linux
On 11/04/2015 12:18 AM, Stephen Hemminger wrote:
> The TIPC case is a missing check for memory allocation failure.
>
Thanks for the report. I will fix it soon.
Regards,
Ying
>
> Begin forwarded message:
>
> Date: Mon, 02 Nov 2015 23:45:55 -0800
> From: scan-admin@...erity.com
> To: stephen@...workplumber.org
> Subject: New Defects reported by Coverity Scan for Linux
>
>
>
> Hi,
>
> Please find the latest report on new defect(s) introduced to Linux found with Coverity Scan.
>
> 4 new defect(s) introduced to Linux found with Coverity Scan.
> 9 defect(s), reported by Coverity Scan earlier, were marked fixed in the recent build analyzed by Coverity Scan.
>
> New defect(s) Reported-by: Coverity Scan
> Showing 4 of 4 defect(s)
>
>
> ** CID 1338065: Error handling issues (CHECKED_RETURN)
> /net/tipc/udp_media.c: 162 in tipc_udp_send_msg()
>
>
> ________________________________________________________________________________________________________
> *** CID 1338065: Error handling issues (CHECKED_RETURN)
> /net/tipc/udp_media.c: 162 in tipc_udp_send_msg()
> 156 struct udp_media_addr *dst = (struct udp_media_addr *)&dest->value;
> 157 struct udp_media_addr *src = (struct udp_media_addr *)&b->addr.value;
> 158 struct sk_buff *clone;
> 159 struct rtable *rt;
> 160
> 161 if (skb_headroom(skb) < UDP_MIN_HEADROOM)
>>>> CID 1338065: Error handling issues (CHECKED_RETURN)
>>>> Calling "pskb_expand_head" without checking return value (as is done elsewhere 51 out of 56 times).
> 162 pskb_expand_head(skb, UDP_MIN_HEADROOM, 0, GFP_ATOMIC);
> 163
> 164 clone = skb_clone(skb, GFP_ATOMIC);
> 165 skb_set_inner_protocol(clone, htons(ETH_P_TIPC));
> 166 ub = rcu_dereference_rtnl(b->media_ptr);
> 167 if (!ub) {
>
> ** CID 1338066: Null pointer dereferences (FORWARD_NULL)
> /net/openvswitch/flow_netlink.c: 1379 in __ovs_nla_put_key()
>
>
> ________________________________________________________________________________________________________
> *** CID 1338066: Null pointer dereferences (FORWARD_NULL)
> /net/openvswitch/flow_netlink.c: 1379 in __ovs_nla_put_key()
> 1373 goto nla_put_failure;
> 1374
> 1375 if (nla_put_u32(skb, OVS_KEY_ATTR_PRIORITY, output->phy.priority))
> 1376 goto nla_put_failure;
> 1377
> 1378 if ((swkey->tun_key.u.ipv4.dst || is_mask)) {
>>>> CID 1338066: Null pointer dereferences (FORWARD_NULL)
>>>> Assigning: "opts" = "NULL".
> 1379 const void *opts = NULL;
> 1380
> 1381 if (output->tun_key.tun_flags & TUNNEL_OPTIONS_PRESENT)
> 1382 opts = TUN_METADATA_OPTS(output, swkey->tun_opts_len);
> 1383
> 1384 if (ipv4_tun_to_nlattr(skb, &output->tun_key, opts,
>
> ** CID 1338067: Integer handling issues (OVERFLOW_BEFORE_WIDEN)
> /drivers/net/ethernet/cavium/thunder/nic_main.c: 407 in nic_config_cpi()
>
>
> ________________________________________________________________________________________________________
> *** CID 1338067: Integer handling issues (OVERFLOW_BEFORE_WIDEN)
> /drivers/net/ethernet/cavium/thunder/nic_main.c: 407 in nic_config_cpi()
> 401 nic_reg_write(nic, NIC_PF_CPI_0_2047_CFG | (cpi << 3),
> 402 (vnic << 24) | (padd << 16) |
> 403 (rssi_base + rssi));
> 404 } else {
> 405 /* Set MPI_ALG to '0' to disable MCAM parsing */
> 406 nic_reg_write(nic, NIC_PF_CPI_0_2047_CFG | (cpi << 3),
>>>> CID 1338067: Integer handling issues (OVERFLOW_BEFORE_WIDEN)
>>>> Potentially overflowing expression "padd << 16" with type "u32" (32 bits, unsigned) is evaluated using 32-bit arithmetic, and then used in a context that expects an expression of type "u64" (64 bits, unsigned).
> 407 (padd << 16));
> 408 /* MPI index is same as CPI if MPI_ALG is not enabled */
> 409 nic_reg_write(nic, NIC_PF_MPI_0_2047_CFG | (cpi << 3),
> 410 (vnic << 24) | (rssi_base + rssi));
> 411 }
> 412
>
> ** CID 1338068: Null pointer dereferences (REVERSE_INULL)
> /include/net/dst_metadata.h: 69 in tun_dst_unclone()
>
>
> ________________________________________________________________________________________________________
> *** CID 1338068: Null pointer dereferences (REVERSE_INULL)
> /include/net/dst_metadata.h: 69 in tun_dst_unclone()
> 63 static inline struct metadata_dst *tun_dst_unclone(struct sk_buff *skb)
> 64 {
> 65 struct metadata_dst *md_dst = skb_metadata_dst(skb);
> 66 int md_size = md_dst->u.tun_info.options_len;
> 67 struct metadata_dst *new_md;
> 68
>>>> CID 1338068: Null pointer dereferences (REVERSE_INULL)
>>>> Null-checking "md_dst" suggests that it may be null, but it has already been dereferenced on all paths leading to the check.
> 69 if (!md_dst)
> 70 return ERR_PTR(-EINVAL);
> 71
> 72 new_md = metadata_dst_alloc(md_size, GFP_ATOMIC);
> 73 if (!new_md)
> 74 return ERR_PTR(-ENOMEM);
>
>
> ________________________________________________________________________________________________________
> To view the defects in Coverity Scan visit, https://scan.coverity.com/projects/linux?tab=overview
>
> To manage Coverity Scan email notifications for "stephen@...workplumber.org", click https://scan.coverity.com/subscriptions/edit?email=stephen%40networkplumber.org&token=41b352b884ef3fc73426635eebc294c3
>
>
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