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Date: Tue, 3 Nov 2015 08:18:12 -0800
From: Stephen Hemminger <stephen@...workplumber.org>
To: Jon Maloy <jon.maloy@...csson.com>,
Ying Xue <ying.xue@...driver.com>
Cc: netdev@...r.kernel.org
Subject: Fw: New Defects reported by Coverity Scan for Linux
The TIPC case is a missing check for memory allocation failure.
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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