[kbuild] net/ceph/messenger_v1.c:1099:23: warning: Boolean result is used in bitwise operation. Clarify expression with parentheses.
From: Dan Carpenter
Date: Tue Jan 19 2021 - 14:53:21 EST
tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: 1e2a199f6ccdc15cf111d68d212e2fd4ce65682e
commit: 2f713615ddd9d805b6c5e79c52e0e11af99d2bf1 libceph: move msgr1 protocol implementation to its own file
compiler: gcc-9 (Debian 9.3.0-15) 9.3.0
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>
cppcheck possible warnings: (new ones prefixed by >>, may not real problems)
>> net/ceph/messenger_v1.c:1099:23: warning: Boolean result is used in bitwise operation. Clarify expression with parentheses. [clarifyCondition]
BUG_ON(!con->in_msg ^ skip);
^
vim +1099 net/ceph/messenger_v1.c
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1033 static int read_partial_message(struct ceph_connection *con)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1034 {
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1035 struct ceph_msg *m = con->in_msg;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1036 int size;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1037 int end;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1038 int ret;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1039 unsigned int front_len, middle_len, data_len;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1040 bool do_datacrc = !ceph_test_opt(from_msgr(con->msgr), NOCRC);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1041 bool need_sign = (con->peer_features & CEPH_FEATURE_MSG_AUTH);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1042 u64 seq;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1043 u32 crc;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1044
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1045 dout("read_partial_message con %p msg %p\n", con, m);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1046
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1047 /* header */
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1048 size = sizeof (con->in_hdr);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1049 end = size;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1050 ret = read_partial(con, end, size, &con->in_hdr);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1051 if (ret <= 0)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1052 return ret;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1053
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1054 crc = crc32c(0, &con->in_hdr, offsetof(struct ceph_msg_header, crc));
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1055 if (cpu_to_le32(crc) != con->in_hdr.crc) {
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1056 pr_err("read_partial_message bad hdr crc %u != expected %u\n",
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1057 crc, con->in_hdr.crc);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1058 return -EBADMSG;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1059 }
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1060
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1061 front_len = le32_to_cpu(con->in_hdr.front_len);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1062 if (front_len > CEPH_MSG_MAX_FRONT_LEN)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1063 return -EIO;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1064 middle_len = le32_to_cpu(con->in_hdr.middle_len);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1065 if (middle_len > CEPH_MSG_MAX_MIDDLE_LEN)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1066 return -EIO;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1067 data_len = le32_to_cpu(con->in_hdr.data_len);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1068 if (data_len > CEPH_MSG_MAX_DATA_LEN)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1069 return -EIO;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1070
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1071 /* verify seq# */
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1072 seq = le64_to_cpu(con->in_hdr.seq);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1073 if ((s64)seq - (s64)con->in_seq < 1) {
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1074 pr_info("skipping %s%lld %s seq %lld expected %lld\n",
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1075 ENTITY_NAME(con->peer_name),
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1076 ceph_pr_addr(&con->peer_addr),
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1077 seq, con->in_seq + 1);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1078 con->in_base_pos = -front_len - middle_len - data_len -
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1079 sizeof_footer(con);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1080 con->in_tag = CEPH_MSGR_TAG_READY;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1081 return 1;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1082 } else if ((s64)seq - (s64)con->in_seq > 1) {
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1083 pr_err("read_partial_message bad seq %lld expected %lld\n",
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1084 seq, con->in_seq + 1);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1085 con->error_msg = "bad message sequence # for incoming message";
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1086 return -EBADE;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1087 }
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1088
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1089 /* allocate message? */
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1090 if (!con->in_msg) {
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1091 int skip = 0;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1092
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1093 dout("got hdr type %d front %d data %d\n", con->in_hdr.type,
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1094 front_len, data_len);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1095 ret = ceph_con_in_msg_alloc(con, &con->in_hdr, &skip);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1096 if (ret < 0)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1097 return ret;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1098
2f713615ddd9d805 Ilya Dryomov 2020-11-12 @1099 BUG_ON(!con->in_msg ^ skip);
! has higher precedence than ^. It's not clear that was intended
necessarily.
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1100 if (skip) {
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1101 /* skip this message */
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1102 dout("alloc_msg said skip message\n");
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1103 con->in_base_pos = -front_len - middle_len - data_len -
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1104 sizeof_footer(con);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1105 con->in_tag = CEPH_MSGR_TAG_READY;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1106 con->in_seq++;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1107 return 1;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1108 }
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1109
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1110 BUG_ON(!con->in_msg);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1111 BUG_ON(con->in_msg->con != con);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1112 m = con->in_msg;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1113 m->front.iov_len = 0; /* haven't read it yet */
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1114 if (m->middle)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1115 m->middle->vec.iov_len = 0;
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1116
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1117 /* prepare for data payload, if any */
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1118
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1119 if (data_len)
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1120 prepare_message_data(con->in_msg, data_len);
2f713615ddd9d805 Ilya Dryomov 2020-11-12 1121 }
---
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