cast to prevent possible integer overflow in filesystem_usage

src/os/aix/aix_sigar.c

@@ -1574,7 +1574,7 @@ int sigar_file_system_list_get(sigar_t *sigar,
 /* XXX this is exactly the same as linux and hpux, solaris is darn close */
 
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
-    ((buf.f * (buf.f_bsize / 512)) >> 1)
+    (((sigar_uint64_t)buf.f * (buf.f_bsize / 512)) >> 1)
 
 #define LSPV_CMD "/usr/sbin/lspv"
 

src/os/darwin/darwin_sigar.c

@@ -288,7 +288,7 @@ int sigar_mem_get(sigar_t *sigar, sigar_mem_t *mem)
 }
 
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
-    ((buf.f * (buf.f_bsize / 512)) >> 1)
+    (((sigar_uint64_t)buf.f * (buf.f_bsize / 512)) >> 1)
 
 #define VM_DIR "/private/var/vm"
 #define SWAPFILE "swapfile"

src/os/hpux/hpux_sigar.c

@@ -523,7 +523,7 @@ int sigar_file_system_list_get(sigar_t *sigar,
 #include <sys/vfs.h>
 
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
-    ((buf.f * (buf.f_bsize / 512)) >> 1)
+    (((sigar_uint64_t)buf.f * (buf.f_bsize / 512)) >> 1)
 
 #define FSDEV_ID(sb) (sb.st_ino + sb.st_dev)
 

src/os/linux/linux_sigar.c

@@ -1343,7 +1343,7 @@ static int get_iostat_procp(sigar_t *sigar,
 #include <sys/vfs.h>
 
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
-    ((buf.f * (buf.f_bsize / 512)) >> 1)
+    (((sigar_uint64_t)buf.f * (buf.f_bsize / 512)) >> 1)
 
 int sigar_file_system_usage_get(sigar_t *sigar,
                                 const char *dirname,

src/os/osf1/osf1_sigar.c

@@ -446,7 +446,7 @@ int sigar_file_system_list_get(sigar_t *sigar,
 }
 
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
-    ((buf.f * (buf.f_bsize / 512)) >> 1)
+    (((sigar_uint64_t)buf.f * (buf.f_bsize / 512)) >> 1)
 
 int sigar_file_system_usage_get(sigar_t *sigar,
                                 const char *dirname,

src/os/solaris/solaris_sigar.c

@@ -1241,7 +1241,7 @@ int sigar_file_system_list_get(sigar_t *sigar,
 #include <sys/statvfs.h>
 
 #define SIGAR_FS_BLOCKS_TO_BYTES(buf, f) \
-    ((buf.f * (buf.f_frsize / 512)) >> 1)
+    (((sigar_uint64_t)buf.f * (buf.f_frsize / 512)) >> 1)
 
 typedef struct {
     char device[PATH_MAX];