diff --git a/block.c b/block.c
index a517d72d7113..310ea89fce62 100644
--- a/block.c
+++ b/block.c
@@ -1228,6 +1228,7 @@ int bdrv_open_image(BlockDriverState **pbs, const char *filename,
                        bdref_key);
             ret = -EINVAL;
         }
+        QDECREF(image_options);
         goto done;
     }
 
diff --git a/block/qapi.c b/block/qapi.c
index 75f44f15371d..97e16418ef4e 100644
--- a/block/qapi.c
+++ b/block/qapi.c
@@ -475,6 +475,7 @@ static void dump_qobject(fprintf_function func_fprintf, void *f,
         case QTYPE_QERROR: {
             QString *value = qerror_human((QError *)obj);
             func_fprintf(f, "%s", qstring_get_str(value));
+            QDECREF(value);
             break;
         }
         case QTYPE_NONE:
diff --git a/block/qcow2.c b/block/qcow2.c
index a4b97e8263c3..a54d2ba89710 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -1308,6 +1308,7 @@ static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp)
     options = qdict_clone_shallow(bs->options);
 
     ret = qcow2_open(bs, options, flags, &local_err);
+    QDECREF(options);
     if (local_err) {
         error_setg(errp, "Could not reopen qcow2 layer: %s",
                    error_get_pretty(local_err));
@@ -1318,8 +1319,6 @@ static void qcow2_invalidate_cache(BlockDriverState *bs, Error **errp)
         return;
     }
 
-    QDECREF(options);
-
     if (crypt_method) {
         s->crypt_method = crypt_method;
         memcpy(&s->aes_encrypt_key, &aes_encrypt_key, sizeof(aes_encrypt_key));
diff --git a/block/raw-posix.c b/block/raw-posix.c
index 6586a0c9e1a6..b7f0f2624bc7 100644
--- a/block/raw-posix.c
+++ b/block/raw-posix.c
@@ -1192,7 +1192,7 @@ static int64_t raw_getlength(BlockDriverState *bs)
         if (size == 0)
 #endif
 #if defined(__APPLE__) && defined(__MACH__)
-        size = LONG_LONG_MAX;
+        size = LLONG_MAX;
 #else
         size = lseek(fd, 0LL, SEEK_END);
 #endif
diff --git a/block/sheepdog.c b/block/sheepdog.c
index 39f746157a62..4ecbf5f498af 100644
--- a/block/sheepdog.c
+++ b/block/sheepdog.c
@@ -2176,6 +2176,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
     strncpy(s->inode.tag, sn_info->name, sizeof(s->inode.tag));
     /* we don't need to update entire object */
     datalen = SD_INODE_SIZE - sizeof(s->inode.data_vdi_id);
+    inode = g_malloc(datalen);
 
     /* refresh inode. */
     fd = connect_to_sdog(s, &local_err);
@@ -2202,8 +2203,6 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
         goto cleanup;
     }
 
-    inode = (SheepdogInode *)g_malloc(datalen);
-
     ret = read_object(fd, (char *)inode, vid_to_vdi_oid(new_vid),
                       s->inode.nr_copies, datalen, 0, s->cache_flags);
 
@@ -2217,6 +2216,7 @@ static int sd_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info)
             s->inode.name, s->inode.snap_id, s->inode.vdi_id);
 
 cleanup:
+    g_free(inode);
     closesocket(fd);
     return ret;
 }
diff --git a/block/vmdk.c b/block/vmdk.c
index 480ea37d7cfb..2b38f61fcda2 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1534,7 +1534,7 @@ static int vmdk_create_extent(const char *filename, int64_t filesize,
     int ret, i;
     BlockDriverState *bs = NULL;
     VMDK4Header header;
-    Error *local_err;
+    Error *local_err = NULL;
     uint32_t tmp, magic, grains, gd_sectors, gt_size, gt_count;
     uint32_t *gd_buf = NULL;
     int gd_buf_size;
@@ -1700,7 +1700,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
 {
     int idx = 0;
     BlockDriverState *new_bs = NULL;
-    Error *local_err;
+    Error *local_err = NULL;
     char *desc = NULL;
     int64_t total_size = 0, filesize;
     const char *adapter_type = NULL;
@@ -1881,7 +1881,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
     } else {
         ret = bdrv_create_file(filename, options, &local_err);
         if (ret < 0) {
-            error_setg_errno(errp, -ret, "Could not create image file");
+            error_propagate(errp, local_err);
             goto exit;
         }
     }
@@ -1889,7 +1889,7 @@ static int vmdk_create(const char *filename, QEMUOptionParameter *options,
     ret = bdrv_open(&new_bs, filename, NULL, NULL,
                     BDRV_O_RDWR | BDRV_O_PROTOCOL, NULL, &local_err);
     if (ret < 0) {
-        error_setg_errno(errp, -ret, "Could not write description");
+        error_propagate(errp, local_err);
         goto exit;
     }
     ret = bdrv_pwrite(new_bs, desc_offset, desc, desc_len);
diff --git a/block/vvfat.c b/block/vvfat.c
index 8f5114bd1690..3cda19f2f3b9 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -787,7 +787,9 @@ static int read_directory(BDRVVVFATState* s, int mapping_index)
 	    s->current_mapping->path=buffer;
 	    s->current_mapping->read_only =
 		(st.st_mode & (S_IWUSR | S_IWGRP | S_IWOTH)) == 0;
-	}
+        } else {
+            g_free(buffer);
+        }
     }
     closedir(dir);
 
@@ -1866,7 +1868,7 @@ static int check_directory_consistency(BDRVVVFATState *s,
 
 	if (s->used_clusters[cluster_num] & USED_ANY) {
 	    fprintf(stderr, "cluster %d used more than once\n", (int)cluster_num);
-	    return 0;
+            goto fail;
 	}
 	s->used_clusters[cluster_num] = USED_DIRECTORY;
 
@@ -2929,6 +2931,7 @@ static int enable_write_target(BDRVVVFATState *s, Error **errp)
     set_option_parameter(options, BLOCK_OPT_BACKING_FILE, "fat:");
 
     ret = bdrv_create(bdrv_qcow, s->qcow_filename, options, errp);
+    free_option_parameters(options);
     if (ret < 0) {
         goto err;
     }
diff --git a/blockdev.c b/blockdev.c
index 8cc42fb1d0f8..9b5261b76598 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -351,7 +351,7 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
     opts = qemu_opts_create(&qemu_common_drive_opts, id, 1, &error);
     if (error) {
         error_propagate(errp, error);
-        return NULL;
+        goto err_no_opts;
     }
 
     qemu_opts_absorb_qdict(opts, bs_opts, &error);
@@ -564,8 +564,9 @@ static DriveInfo *blockdev_init(const char *file, QDict *bs_opts,
     g_free(dinfo->id);
     g_free(dinfo);
 early_err:
-    QDECREF(bs_opts);
     qemu_opts_del(opts);
+err_no_opts:
+    QDECREF(bs_opts);
     return NULL;
 }
 
@@ -939,6 +940,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
 
     /* Actual block device init: Functionality shared with blockdev-add */
     dinfo = blockdev_init(filename, bs_opts, &local_err);
+    bs_opts = NULL;
     if (dinfo == NULL) {
         if (local_err) {
             error_report("%s", error_get_pretty(local_err));
@@ -976,6 +978,7 @@ DriveInfo *drive_init(QemuOpts *all_opts, BlockInterfaceType block_default_type)
 
 fail:
     qemu_opts_del(legacy_opts);
+    QDECREF(bs_opts);
     return dinfo;
 }
 
diff --git a/qemu-img.c b/qemu-img.c
index 1ad899e03bec..b3d2bc6f0246 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -287,6 +287,7 @@ static int print_block_option_help(const char *filename, const char *fmt)
         proto_drv = bdrv_find_protocol(filename, true);
         if (!proto_drv) {
             error_report("Unknown protocol '%s'", filename);
+            free_option_parameters(create_options);
             return 1;
         }
         create_options = append_option_parameters(create_options,
@@ -662,9 +663,7 @@ static int img_check(int argc, char **argv)
     ret = collect_image_check(bs, check, filename, fmt, fix);
 
     if (ret == -ENOTSUP) {
-        if (output_format == OFORMAT_HUMAN) {
-            error_report("This image format does not support checks");
-        }
+        error_report("This image format does not support checks");
         ret = 63;
         goto fail;
     }
@@ -1454,7 +1453,7 @@ static int img_convert(int argc, char **argv)
     ret = bdrv_parse_cache_flags(cache, &flags);
     if (ret < 0) {
         error_report("Invalid cache option: %s", cache);
-        return -1;
+        goto out;
     }
 
     out_bs = bdrv_new_open("target", out_filename, out_fmt, flags, true, quiet);
diff --git a/qemu-io.c b/qemu-io.c
index 9fcd72bb1093..795cf46c6e5c 100644
--- a/qemu-io.c
+++ b/qemu-io.c
@@ -54,6 +54,7 @@ static int openfile(char *name, int flags, int growable, QDict *opts)
 
     if (qemuio_bs) {
         fprintf(stderr, "file open already, try 'help close'\n");
+        QDECREF(opts);
         return 1;
     }
 
@@ -61,7 +62,8 @@ static int openfile(char *name, int flags, int growable, QDict *opts)
         if (bdrv_open(&qemuio_bs, name, NULL, opts, flags | BDRV_O_PROTOCOL,
                       NULL, &local_err))
         {
-            fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
+            fprintf(stderr, "%s: can't open%s%s: %s\n", progname,
+                    name ? " device " : "", name ?: "",
                     error_get_pretty(local_err));
             error_free(local_err);
             return 1;
@@ -72,7 +74,8 @@ static int openfile(char *name, int flags, int growable, QDict *opts)
         if (bdrv_open(&qemuio_bs, name, NULL, opts, flags, NULL, &local_err)
             < 0)
         {
-            fprintf(stderr, "%s: can't open device %s: %s\n", progname, name,
+            fprintf(stderr, "%s: can't open%s%s: %s\n", progname,
+                    name ? " device " : "", name ?: "",
                     error_get_pretty(local_err));
             error_free(local_err);
             bdrv_unref(qemuio_bs);
@@ -118,6 +121,7 @@ static const cmdinfo_t open_cmd = {
 
 static QemuOptsList empty_opts = {
     .name = "drive",
+    .merge_lists = true,
     .head = QTAILQ_HEAD_INITIALIZER(empty_opts.head),
     .desc = {
         /* no elements => accept any params */
@@ -132,7 +136,7 @@ static int open_f(BlockDriverState *bs, int argc, char **argv)
     int growable = 0;
     int c;
     QemuOpts *qopts;
-    QDict *opts = NULL;
+    QDict *opts;
 
     while ((c = getopt(argc, argv, "snrgo:")) != EOF) {
         switch (c) {
@@ -149,15 +153,14 @@ static int open_f(BlockDriverState *bs, int argc, char **argv)
             growable = 1;
             break;
         case 'o':
-            qopts = qemu_opts_parse(&empty_opts, optarg, 0);
-            if (qopts == NULL) {
+            if (!qemu_opts_parse(&empty_opts, optarg, 0)) {
                 printf("could not parse option list -- %s\n", optarg);
+                qemu_opts_reset(&empty_opts);
                 return 0;
             }
-            opts = qemu_opts_to_qdict(qopts, opts);
-            qemu_opts_del(qopts);
             break;
         default:
+            qemu_opts_reset(&empty_opts);
             return qemuio_command_usage(&open_cmd);
         }
     }
@@ -166,11 +169,16 @@ static int open_f(BlockDriverState *bs, int argc, char **argv)
         flags |= BDRV_O_RDWR;
     }
 
+    qopts = qemu_opts_find(&empty_opts, NULL);
+    opts = qopts ? qemu_opts_to_qdict(qopts, NULL) : NULL;
+    qemu_opts_reset(&empty_opts);
+
     if (optind == argc - 1) {
         return openfile(argv[optind], flags, growable, opts);
     } else if (optind == argc) {
         return openfile(NULL, flags, growable, opts);
     } else {
+        QDECREF(opts);
         return qemuio_command_usage(&open_cmd);
     }
 }