From a3ede18c5d3e652e9d0bade4b28193e666198574 Mon Sep 17 00:00:00 2001
From: dimitri staessens <dimitri.staessens@ugent.be>
Date: Wed, 24 May 2017 15:08:33 +0200
Subject: lib: Fix bug in bitmap

---
 src/lib/bitmap.c            | 11 +++++------
 src/lib/tests/bitmap_test.c | 15 +++++++++++++--
 2 files changed, 18 insertions(+), 8 deletions(-)

(limited to 'src')

diff --git a/src/lib/bitmap.c b/src/lib/bitmap.c
index bf9bb99d..ec663ec7 100644
--- a/src/lib/bitmap.c
+++ b/src/lib/bitmap.c
@@ -50,7 +50,7 @@ static size_t find_next_zero_bit(const size_t * addr,
         tmp = ~addr[start];
         while (!tmp) {
                 start++;
-                if (start >= (nbits / BITS_PER_LONG))
+                if (start >= DIV_ROUND_UP(nbits, BITS_PER_LONG))
                         return nbits;
 
                 tmp = ~addr[start];
@@ -69,8 +69,7 @@ static size_t find_next_zero_bit(const size_t * addr,
 static void bitmap_zero(size_t * dst,
                         size_t   nbits)
 {
-        size_t len = BITS_TO_LONGS(nbits) * sizeof(size_t);
-        memset(dst, 0, len);
+        memset(dst, 0, BITS_TO_LONGS(nbits) * sizeof(size_t));
 }
 
 static void bitmap_clear(size_t * map,
@@ -92,8 +91,8 @@ static void bitmap_set(size_t * map,
 }
 
 struct bmp {
-        ssize_t offset;
-        size_t size;
+        ssize_t  offset;
+        size_t   size;
 
         size_t * bitmap;
 };
@@ -116,7 +115,7 @@ struct bmp * bmp_create(size_t  bits,
                 return NULL;
         }
 
-        tmp->size = bits;
+        tmp->size   = bits;
         tmp->offset = offset;
         bitmap_zero(tmp->bitmap, bits);
 
diff --git a/src/lib/tests/bitmap_test.c b/src/lib/tests/bitmap_test.c
index e438f217..4f58de3b 100644
--- a/src/lib/tests/bitmap_test.c
+++ b/src/lib/tests/bitmap_test.c
@@ -30,7 +30,7 @@
 int bitmap_test(int argc, char ** argv)
 {
         struct bmp * bmp;
-        size_t bits = BITMAP_SIZE;
+        ssize_t bits = BITMAP_SIZE;
         ssize_t id;
         int i;
         ssize_t r;
@@ -57,8 +57,19 @@ int bitmap_test(int argc, char ** argv)
 
         for (i = offset; i < BITMAP_SIZE + 5 + offset; i++) {
                 id = bmp_allocate(bmp);
-                if (!bmp_is_id_valid(bmp, id))
+                if (!bmp_is_id_valid(bmp, id)) {
+                        if (i < BITMAP_SIZE + offset) {
+                                printf("Failed valid ID %d (%zd).\n", i, id);
+                                bmp_destroy(bmp);
+                                return -1;
+                        }
+                        if (id >= offset && id < bits + offset) {
+                                printf("Valid ID %zd returned invalid.\n", id);
+                                bmp_destroy(bmp);
+                                return -1;
+                        }
                         continue;
+                }
 
                 if (!bmp_is_id_used(bmp, id)) {
                         printf("ID not marked in use.\n");
-- 
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