statfs::f_type is usually a signed type, so cast it to unsigned to check its value against magic values of filesystems. --- common/mlutils/unix_utils-c.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/common/mlutils/unix_utils-c.c b/common/mlutils/unix_utils-c.c index f8c4f8abe..2afdc9e5f 100644 --- a/common/mlutils/unix_utils-c.c +++ b/common/mlutils/unix_utils-c.c @@ -357,9 +357,9 @@ guestfs_int_mllib_statvfs_is_network_filesystem (value pathv) #define SMB_SUPER_MAGIC 0x517b #endif - return Val_bool (buf.f_type == CIFS_MAGIC_NUMBER || - buf.f_type == NFS_SUPER_MAGIC || - buf.f_type == SMB_SUPER_MAGIC); + return Val_bool ((unsigned int) buf.f_type == CIFS_MAGIC_NUMBER || + (unsigned int) buf.f_type == NFS_SUPER_MAGIC || + (unsigned int) buf.f_type == SMB_SUPER_MAGIC); #else return Val_bool (0); #endif