Fix coverity defects

1.coverity scan CID:147445 function zfs_do_send in zfs_main.c
Buffer not null terminated (BUFFER_SIZE_WARNING)

2.coverity scan CID:147443 function zfs_do_bookmark in zfs_main.c
Buffer not null terminated (BUFFER_SIZE_WARNING)

3.coverity scan CID:147660 function main in zinject.c
Passing string argv[0] of unknown size to strcpy
By the way, the leak of g_zfs is fixed.

4.coverity scan CID: 147442 function make_disks in zpool_vdev.c
Buffer not null terminated (BUFFER_SIZE_WARNING)

5.coverity scan CID: 147661 function main in dir_rd_update.c
passing string cp1 of unknown size to strcpy

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: luozhengzheng <luo.zhengzheng@zte.com.cn>
Closes #5130

cmd/zfs/zfs_main.c

@@ -3865,7 +3865,7 @@ zfs_do_send(int argc, char **argv)
 			 * Incremental source name begins with # or @.
 			 * Default to same fs as target.
 			 */
-			(void) strncpy(frombuf, argv[0], sizeof (frombuf));
+			(void) strlcpy(frombuf, argv[0], sizeof (frombuf));
 			cp = strchr(frombuf, '@');
 			if (cp != NULL)
 				*cp = '\0';
@@ -6771,7 +6771,7 @@ zfs_do_bookmark(int argc, char **argv)
 		*strchr(snapname, '#') = '\0';
 		(void) strlcat(snapname, argv[0], sizeof (snapname));
 	} else {
-		(void) strncpy(snapname, argv[0], sizeof (snapname));
+		(void) strlcpy(snapname, argv[0], sizeof (snapname));
 	}
 	zhp = zfs_open(g_zfs, snapname, ZFS_TYPE_SNAPSHOT);
 	if (zhp == NULL)

cmd/zinject/zinject.c

@@ -681,6 +681,7 @@ main(int argc, char **argv)
 
 	if ((zfs_fd = open(ZFS_DEV, O_RDWR)) < 0) {
 		(void) fprintf(stderr, "failed to open ZFS device\n");
+		libzfs_fini(g_zfs);
 		return (1);
 	}
 
@@ -695,7 +696,7 @@ main(int argc, char **argv)
 			(void) printf("Run 'zinject -h' for usage "
 			    "information.\n");
 		}
-
+		libzfs_fini(g_zfs);
 		return (0);
 	}
 
@@ -714,6 +715,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid action '%s': "
 				    "must be 'degrade' or 'fault'\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -735,6 +737,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid i/o delay "
 				    "value: '%s'\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -752,6 +755,7 @@ main(int argc, char **argv)
 				    "'%s': must be 'io', 'checksum' or "
 				    "'nxio'\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -760,6 +764,7 @@ main(int argc, char **argv)
 			if (record.zi_freq < 1 || record.zi_freq > 100) {
 				(void) fprintf(stderr, "frequency range must "
 				    "be in the range (0, 100]\n");
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -773,6 +778,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid duration '%s': "
 				    "must be a positive integer\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			/* store duration of txgs as its negative */
@@ -780,6 +786,7 @@ main(int argc, char **argv)
 			break;
 		case 'h':
 			usage();
+			libzfs_fini(g_zfs);
 			return (0);
 		case 'I':
 			/* default duration, if one hasn't yet been defined */
@@ -793,6 +800,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid level '%s': "
 				    "must be an integer\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -817,6 +825,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid duration '%s': "
 				    "must be a positive integer\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -836,6 +845,7 @@ main(int argc, char **argv)
 				    "'%s': must be 'read', 'write', 'free', "
 				    "'claim' or 'all'\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -845,6 +855,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid type '%s'\n",
 				    optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -857,6 +868,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid label type "
 				    "'%s'\n", optarg);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			break;
@@ -864,11 +876,13 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "option -%c requires an "
 			    "operand\n", optopt);
 			usage();
+			libzfs_fini(g_zfs);
 			return (1);
 		case '?':
 			(void) fprintf(stderr, "invalid option '%c'\n",
 			    optopt);
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 	}
@@ -888,11 +902,13 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "cancel (-c) incompatible with "
 			    "any other options\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 		if (argc != 0) {
 			(void) fprintf(stderr, "extraneous argument to '-c'\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
@@ -904,6 +920,7 @@ main(int argc, char **argv)
 				(void) fprintf(stderr, "invalid handle id '%s':"
 				    " must be an integer or 'all'\n", cancel);
 				usage();
+				libzfs_fini(g_zfs);
 				return (1);
 			}
 			return (cancel_handler(id));
@@ -920,6 +937,7 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "device (-d) incompatible with "
 			    "data error injection\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
@@ -927,21 +945,25 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "device (-d) injection requires "
 			    "a single pool name\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
-		(void) strcpy(pool, argv[0]);
+		(void) strlcpy(pool, argv[0], sizeof (pool));
 		dataset[0] = '\0';
 
 		if (error == ECKSUM) {
 			(void) fprintf(stderr, "device error type must be "
 			    "'io' or 'nxio'\n");
+			libzfs_fini(g_zfs);
 			return (1);
 		}
 
 		record.zi_iotype = io_type;
-		if (translate_device(pool, device, label, &record) != 0)
+		if (translate_device(pool, device, label, &record) != 0) {
+			libzfs_fini(g_zfs);
 			return (1);
+		}
 		if (!error)
 			error = ENXIO;
 
@@ -954,6 +976,7 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "raw (-b) format with "
 			    "any other options\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
@@ -961,21 +984,25 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "raw (-b) format expects a "
 			    "single pool name\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
-		(void) strcpy(pool, argv[0]);
+		(void) strlcpy(pool, argv[0], sizeof (pool));
 		dataset[0] = '\0';
 
 		if (error == ENXIO) {
 			(void) fprintf(stderr, "data error type must be "
 			    "'checksum' or 'io'\n");
+			libzfs_fini(g_zfs);
 			return (1);
 		}
 
 		record.zi_cmd = ZINJECT_DATA_FAULT;
-		if (translate_raw(raw, &record) != 0)
+		if (translate_raw(raw, &record) != 0) {
+			libzfs_fini(g_zfs);
 			return (1);
+		}
 		if (!error)
 			error = EIO;
 	} else if (record.zi_cmd == ZINJECT_PANIC) {
@@ -984,6 +1011,7 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "panic (-p) incompatible with "
 			    "other options\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
@@ -991,10 +1019,11 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "panic (-p) injection requires "
 			    "a single pool name and an optional id\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
-		(void) strcpy(pool, argv[0]);
+		(void) strlcpy(pool, argv[0], sizeof (pool));
 		if (argv[1] != NULL)
 			record.zi_type = atoi(argv[1]);
 		dataset[0] = '\0';
@@ -1003,21 +1032,24 @@ main(int argc, char **argv)
 			(void) fprintf(stderr, "-s or -g meaningless "
 			    "without -I (ignore writes)\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		} else if (dur_secs && dur_txg) {
 			(void) fprintf(stderr, "choose a duration either "
 			    "in seconds (-s) or a number of txgs (-g) "
 			    "but not both\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		} else if (argc != 1) {
 			(void) fprintf(stderr, "ignore writes (-I) "
 			    "injection requires a single pool name\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
-		(void) strcpy(pool, argv[0]);
+		(void) strlcpy(pool, argv[0], sizeof (pool));
 		dataset[0] = '\0';
 	} else if (type == TYPE_INVAL) {
 		if (flags == 0) {
@@ -1025,16 +1057,18 @@ main(int argc, char **argv)
 			    "'-t', '-a', '-p', '-I' or '-u' "
 			    "must be specified\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
 		if (argc == 1 && (flags & ZINJECT_UNLOAD_SPA)) {
-			(void) strcpy(pool, argv[0]);
+			(void) strlcpy(pool, argv[0], sizeof (pool));
 			dataset[0] = '\0';
 		} else if (argc != 0) {
 			(void) fprintf(stderr, "extraneous argument for "
 			    "'-f'\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
@@ -1043,19 +1077,23 @@ main(int argc, char **argv)
 		if (argc != 1) {
 			(void) fprintf(stderr, "missing object\n");
 			usage();
+			libzfs_fini(g_zfs);
 			return (2);
 		}
 
 		if (error == ENXIO) {
 			(void) fprintf(stderr, "data error type must be "
 			    "'checksum' or 'io'\n");
+			libzfs_fini(g_zfs);
 			return (1);
 		}
 
 		record.zi_cmd = ZINJECT_DATA_FAULT;
 		if (translate_record(type, argv[0], range, level, &record, pool,
-		    dataset) != 0)
+		    dataset) != 0) {
+		    libzfs_fini(g_zfs);
 			return (1);
+		}
 		if (!error)
 			error = EIO;
 	}
@@ -1066,10 +1104,15 @@ main(int argc, char **argv)
 	 * time we access the pool.
 	 */
 	if (dataset[0] != '\0' && domount) {
-		if ((zhp = zfs_open(g_zfs, dataset, ZFS_TYPE_DATASET)) == NULL)
+		if ((zhp = zfs_open(g_zfs, dataset,
+			ZFS_TYPE_DATASET)) == NULL) {
+			libzfs_fini(g_zfs);
 			return (1);
-		if (zfs_unmount(zhp, NULL, 0) != 0)
+		}
+		if (zfs_unmount(zhp, NULL, 0) != 0) {
+			libzfs_fini(g_zfs);
 			return (1);
+		}
 	}
 
 	record.zi_error = error;

cmd/zpool/zpool_vdev.c

@@ -1199,7 +1199,7 @@ make_disks(zpool_handle_t *zhp, nvlist_t *nv)
 		 * window between when udev deletes and recreates the link
 		 * during which access attempts will fail with ENOENT.
 		 */
-		strncpy(udevpath, path, MAXPATHLEN);
+		strlcpy(udevpath, path, MAXPATHLEN);
 		(void) zfs_append_partition(udevpath, MAXPATHLEN);
 
 		fd = open(devpath, O_RDWR|O_EXCL);

tests/zfs-tests/cmd/dir_rd_update/dir_rd_update.c

@@ -63,6 +63,11 @@ main(int argc, char **argv)
 	}
 
 	cp1 = argv[1];
+	if (strlen(cp1) >= (sizeof (dirpath) - strlen("TMP_DIR"))) {
+		(void) printf("The string length of mount point is "
+			"too large\n");
+		exit(-1);
+	}
 	(void) strcpy(&dirpath[0], (const char *)cp1);
 	(void) strcat(&dirpath[strlen(dirpath)], "TMP_DIR");