diff --git a/src/backend/backend.c b/src/backend/backend.c
index fed9c95..b7b93fd 100644
--- a/src/backend/backend.c
+++ b/src/backend/backend.c
@@ -89,13 +89,13 @@ fs_backend *fs_backend_init(const char *db_name, int flags)
     ret->md = fs_metadata_open(db_name);
     if (!ret->md) {
 	fs_error(LOG_CRIT, "cannot read metadata file for kb %s", db_name);
-
+	free(ret);
 	return NULL;
     }
 
     if (!fs_metadata_get_string(ret->md, FS_MD_NAME, NULL)) {
 	fs_error(LOG_ERR, "no value for KB name in metadata, does KB exist?");
-
+	free(ret);
 	return NULL;
     }
 
@@ -103,20 +103,20 @@ fs_backend *fs_backend_init(const char *db_name, int flags)
     if (strcmp(hashfunc, FS_HASH)) {
 	fs_error(LOG_ERR, "stored hash function does not match server's hash function");
 	fs_error(LOG_ERR, "rebuild code with correct function or replace store");
-
+	free(ret);
 	return NULL;
     }
 
     const char *store_type = fs_metadata_get_string(ret->md, FS_MD_STORE, "semi-native");
     if (strcmp(store_type, "native")) {
 	fs_error(LOG_ERR, "tried to open %s store with native backend", store_type);
-
+	free(ret);
 	return NULL;
     }
 
     if (strcmp(fs_metadata_get_string(ret->md, FS_MD_NAME, "-no-match-"), db_name)) {
 	fs_error(LOG_CRIT, "metadata and opened KB name don't match %s / %s", db_name, fs_metadata_get_string(ret->md, FS_MD_NAME, "-no-match-"));
-
+	free(ret);
 	return NULL;
     }
 
@@ -124,13 +124,13 @@ fs_backend *fs_backend_init(const char *db_name, int flags)
     const int version = fs_metadata_get_int(ret->md, FS_MD_VERSION, 0);
     if (version == -1) {
 	fs_error(LOG_CRIT, "cannot find number of segments in KB %s", db_name);
-
+	free(ret);
 	return NULL;
     }
     if (version > FS_CURRENT_TABLE_VERSION ||
         version < FS_EARLIEST_TABLE_VERSION) {
 	fs_error(LOG_ERR, "wrong table metadata version in KB %s", db_name);
-
+	free(ret);
 	return NULL;
     }
 
diff --git a/src/backend/chain.c b/src/backend/chain.c
index 0028ece..bbb0867 100644
--- a/src/backend/chain.c
+++ b/src/backend/chain.c
@@ -103,7 +103,7 @@ fs_chain *fs_chain_open_filename(const char *fname, int flags)
     bc->fd = open(fname, FS_O_NOATIME | flags, FS_FILE_MODE);
     if (bc->fd == -1) {
         fs_error(LOG_CRIT, "failed to open chain %s: %s", fname, strerror(errno));
-
+        free(bc);
         return NULL;
     }
     bc->filename = g_strdup(fname);
@@ -117,7 +117,7 @@ fs_chain *fs_chain_open_filename(const char *fname, int flags)
     }
     if (header.id != CHAIN_ID) {
         fs_error(LOG_CRIT, "%s does not look like a chain file", bc->filename);
-
+        free(bc);
         return NULL;
     }
     if (map_bc(bc, header.length, header.size)) {
diff --git a/src/backend/list.c b/src/backend/list.c
index 6c4420c..427285b 100644
--- a/src/backend/list.c
+++ b/src/backend/list.c
@@ -85,23 +85,23 @@ fs_list *fs_list_open_filename(const char *filename, size_t width, int flags)
     l->fd = open(filename, FS_O_NOATIME | flags, FS_FILE_MODE);
     if (l->fd == -1) {
         fs_error(LOG_ERR, "failed to open list file '%s': %s", l->filename, strerror(errno));
-
+        free(l);
         return NULL;
     }
     if ((flags & (O_WRONLY | O_RDWR)) && flock(l->fd, LOCK_EX) == -1) {
         fs_error(LOG_ERR, "failed to open list: %s, cannot get lock: %s", filename, strerror(errno));
-
+        free(l);
         return NULL;
     }
     off_t end = lseek(l->fd, 0, SEEK_END);
     if (end == -1) {
         fs_error(LOG_CRIT, "failed to open list: %s, cannot seek to end", filename);
-
+        free(l);
         return NULL;
     }
     if (end % width != 0) {
         fs_error(LOG_CRIT, "failed to open list: %s, length not multiple of data size", filename);
-
+        free(l);
         return NULL;
     }
     l->offset = end / width;
@@ -111,7 +111,7 @@ fs_list *fs_list_open_filename(const char *filename, size_t width, int flags)
     if (l->fd == -1) {
         fs_error(LOG_CRIT, "failed to open list %s: %s", filename,
                 strerror(errno));
-
+        free(l);
         return NULL;
     }
 
diff --git a/src/backend/metadata.c b/src/backend/metadata.c
index 76f8859..6d9007e 100644
--- a/src/backend/metadata.c
+++ b/src/backend/metadata.c
@@ -77,14 +77,14 @@ fs_metadata *fs_metadata_open(const char *kb)
     if ((fd = open(m->uri + 7, FS_O_NOATIME | O_CREAT, FS_FILE_MODE)) == -1) {
         fs_error(LOG_CRIT, "failed to touch metadata file %s: %s",
             m->uri, strerror(errno));
-
+        free(m);
         return NULL;
     }
     close(fd);
     m->rw = raptor_new_world();
     if (!m->rw) {
         fs_error(LOG_CRIT, "failed to initialise raptor");
-
+        free(m);
         return NULL;
     }
     raptor_parser *rdf_parser = raptor_new_parser(m->rw, "turtle");
diff --git a/src/backend/mhash.c b/src/backend/mhash.c
index 4264cd7..d5403b8 100644
--- a/src/backend/mhash.c
+++ b/src/backend/mhash.c
@@ -100,7 +100,7 @@ fs_mhash *fs_mhash_open_filename(const char *filename, int flags)
     mh->flags = flags;
     if (mh->fd == -1) {
         fs_error(LOG_ERR, "cannot open mhash file '%s': %s", filename, strerror(errno));
-
+        free(mh);
         return NULL;
     }
     mh->filename = g_strdup(filename);
diff --git a/src/backend/ptable.c b/src/backend/ptable.c
index 58381a8..724118b 100644
--- a/src/backend/ptable.c
+++ b/src/backend/ptable.c
@@ -134,11 +134,13 @@ fs_ptable *fs_ptable_open_filename(const char *fname, int flags)
 
     if (sizeof(struct ptable_header) != 512) {
         fs_error(LOG_CRIT, "ptable header size not 512 bytes");
+        free(pt);
         return NULL;
     }
     pt->fd = open(fname, FS_O_NOATIME | flags, FS_FILE_MODE);
     if (pt->fd == -1) {
         fs_error(LOG_CRIT, "failed to open ptable %s: %s", fname, strerror(errno));
+        free(pt);
         return NULL;
     }
     pt->filename = g_strdup(fname);
diff --git a/src/backend/rhash.c b/src/backend/rhash.c
index 2ccf3d1..2956e6b 100644
--- a/src/backend/rhash.c
+++ b/src/backend/rhash.c
@@ -169,7 +169,7 @@ fs_rhash *fs_rhash_open_filename(const char *filename, int flags)
     rh->flags = flags;
     if (rh->fd == -1) {
         fs_error(LOG_ERR, "cannot open rhash file '%s': %s", filename, strerror(errno));
-
+        free(rh);
         return NULL;
     }
     rh->z_buffer_size = 1024;
diff --git a/src/backend/tbchain.c b/src/backend/tbchain.c
index ecbb468..8c7a443 100644
--- a/src/backend/tbchain.c
+++ b/src/backend/tbchain.c
@@ -165,6 +165,7 @@ fs_tbchain *fs_tbchain_open_filename(const char *fname, int flags)
     bc->fd = open(fname, FS_O_NOATIME | flags, FS_FILE_MODE);
     if (bc->fd == -1) {
         fs_error(LOG_CRIT, "failed to open chain %s: %s", fname, strerror(errno));
+        free(bc);
         return NULL;
     }
     bc->filename = g_strdup(fname);
@@ -172,16 +173,19 @@ fs_tbchain *fs_tbchain_open_filename(const char *fname, int flags)
 
     if (sizeof(*header) != 512) {
         fs_error(LOG_CRIT, "tbchain header size is %zd, not 512 bytes", sizeof(header));
+        free(bc);
         return NULL;
     }
     if (sizeof(fs_tblock) != FS_TBLOCK_SIZE) {
         fs_error(LOG_CRIT, "tblock size is %zd, not %d bytes", sizeof(fs_tblock), FS_TBLOCK_SIZE);
+        free(bc);
         return NULL;
     }
     int init_reqd = 0;
 
     if (bc->flags & O_TRUNC && ftruncate(bc->fd, sizeof(*header))) {
         fs_error(LOG_CRIT, "ftruncate failed on %s: %s", fname, strerror(errno));
+        free(bc);
         return NULL;
     }
 
@@ -192,6 +196,7 @@ fs_tbchain *fs_tbchain_open_filename(const char *fname, int flags)
     if (header == MAP_FAILED || header == NULL) {
         munmap(header, sizeof(*header));
         fs_error(LOG_CRIT, "header mmap failed for %s: %s", bc->filename, strerror(errno));
+        free(bc);
         return NULL;
     }
 
diff --git a/src/backend/tlist.c b/src/backend/tlist.c
index acb8bf4..e4897c5 100644
--- a/src/backend/tlist.c
+++ b/src/backend/tlist.c
@@ -130,7 +130,7 @@ fs_tlist *fs_tlist_open_filename(const char *filename, int flags)
         if (length == HEADER && header.id != TLIST_ID) {
             fs_error(LOG_ERR, "“%s” does not appear to be a tlist", filename);
             close(l->fd);
-
+            free(l);
             return NULL;
         }
         l->offset = header.length;
@@ -141,7 +141,7 @@ fs_tlist *fs_tlist_open_filename(const char *filename, int flags)
     if ((flags & (O_WRONLY | O_RDWR)) && flock(l->fd, LOCK_EX) == -1) {
         fs_error(LOG_ERR, "failed to open list: %s, cannot get lock: %s", filename, strerror(errno));
         close(l->fd);
-
+        free(l);
         return NULL;
     }
     write_header(l);
@@ -150,7 +150,7 @@ fs_tlist *fs_tlist_open_filename(const char *filename, int flags)
     if (l->fd == -1) {
         fs_error(LOG_CRIT, "failed to open list %s: %s", filename,
                 strerror(errno));
-
+        free(l);
         return NULL;
     }
 
diff --git a/src/backend/tree.c b/src/backend/tree.c
index dd73d2c..257860a 100644
--- a/src/backend/tree.c
+++ b/src/backend/tree.c
@@ -192,6 +192,7 @@ fs_tree *fs_tree_open_filename(fs_backend *be, const char *name, const char *fil
     int fd = open(filename, FS_O_NOATIME | O_RDWR | flags, FS_FILE_MODE);
     if (fd == -1) {
         fs_error(LOG_ERR, "failed to open tree file '%s': %s", filename, strerror(errno));
+        free(t);
         return NULL;
     }
     t->filename = (char *)filename;
@@ -214,13 +215,13 @@ fs_tree *fs_tree_open_filename(fs_backend *be, const char *name, const char *fil
     if (header.id != TREE_ID) {
         fs_error(LOG_ERR, "'%s' does not appear to be a valid treefile", filename);
         close(fd);
-
+        free(t);
         return NULL;
     }
     t->bc = fs_chain_open_filename(header.chainfile, flags);
     if (!t->bc) {
         fs_error(LOG_CRIT, "failed to open chain file '%s'", header.chainfile);
-
+        free(t);
         return NULL;
     }
 
diff --git a/src/common/umac.c b/src/common/umac.c
index 1c82230..c6d1dd1 100644
--- a/src/common/umac.c
+++ b/src/common/umac.c
@@ -2095,7 +2095,7 @@ static int umac_verify(void)
     }
     printf("Done.\n");
     umac_delete(ctx);
-
+    free(data_ptr);
     return return_value;
 }
 
diff --git a/src/frontend/results.c b/src/frontend/results.c
index eaf61a4..e411d5b 100644
--- a/src/frontend/results.c
+++ b/src/frontend/results.c
@@ -3169,7 +3169,7 @@ int fs_sort_column(fs_query *q, fs_binding *b, int col, int **sorted)
         if (!sort) {
             /* this shouldn't happen, but just incase */
             fs_error(LOG_ERR, "cannot get sortable string for %016llx", rid);
-
+            free(sortable);
             return 1;
         }
         sortable[row].str = sort;
diff --git a/src/libs/stemmer/libstemmer/libstemmer.c b/src/libs/stemmer/libstemmer/libstemmer.c
index 5c3852a..838952a 100644
--- a/src/libs/stemmer/libstemmer/libstemmer.c
+++ b/src/libs/stemmer/libstemmer/libstemmer.c
@@ -40,7 +40,10 @@ sb_stemmer_new(const char * algorithm, const char * charenc)
 	    (struct sb_stemmer *) malloc(sizeof(struct sb_stemmer));
     if (stemmer == NULL) return NULL;
     enc = sb_getenc(charenc);
-    if (enc == ENC_UNKNOWN) return NULL;
+    if (enc == ENC_UNKNOWN){ 
+    	free(stemmer);
+    	return NULL;
+    }
 
     for (module = modules; module->name != 0; module++) {
 	if (strcmp(module->name, algorithm) == 0 && module->enc == enc) break;
diff --git a/src/libs/stemmer/libstemmer/libstemmer_utf8.c b/src/libs/stemmer/libstemmer/libstemmer_utf8.c
index 793a081..a4dcce3 100644
--- a/src/libs/stemmer/libstemmer/libstemmer_utf8.c
+++ b/src/libs/stemmer/libstemmer/libstemmer_utf8.c
@@ -45,7 +45,10 @@ sb_stemmer_new(const char * algorithm, const char * charenc)
     for (module = modules; module->name != 0; module++) {
 	if (strcmp(module->name, algorithm) == 0 && module->enc == enc) break;
     }
-    if (module->name == NULL) return NULL;
+    if (module->name == NULL){
+    	free(stemmer);
+    	return NULL;	
+    } 
     
     stemmer->create = module->create;
     stemmer->close = module->close;