ArgumentException on Image.FromStream when reading from Database

Question

Ok, here is the thing. My program saves an image into a SQL Server Database, the column being of image type. When I try to recover it, I get an ArgumentException from the Imagen.FromStream method.

The code that inserts the image is something like this:

Bitmap img = (Bitmap)pictureBox.Image;
MemoryStream m = new MemoryStream();
img.Save(m, ImageFormat.Png);

try{
    string query = "INSERT INTO Images (imgId, image) " + 
                   "VALUES (1, @Img)"

    byte[] imgByte = m.GetBuffer();

    SqlConnection con = new SqlConnection(connectionString);
    con.Open();
    SqlCommand cmd = new SqlCommand(query, con);

    cmd.Parameters.Add(new SqlParameter("@Img", SqlDbType.Image)).Value = img;

    cmd.ExecuteNonQuery();
} catch (Exception ex) {
    //some code
} finally {
    con.Close();
    con.Dispose();
    cmd.Dispose();
}

That seems to work fine, when I check the table it says it holds "Binary Data" (Probably there's a way to see the image, I don't know).

Now, here is the code that recovers the image:

string query = "SELECT image " + 
               "FROM Images " +
               "WHERE imgId = 1";

bool ok;

try{
    SqlConnection con = new SqlConnection(connectionString);
    con.Open();

    SqlCommand cmd = new SqlCommand(query, con);
    byte[] imgByte = (byte[])cmd.ExecuteScalar();
    MemoryStream m = new MemoryStream(imgByte);

    ok = true
} catch (Exception ex) {
    m = null;
} finally {
    con.Close();
    con.Dispose();
    cmd.Dispose();
}

if (ok)
    Bitmap img = new Bitmap(Image.FromStream(m)); //Here it throws the exception

I don't know much about image handling, so what you see is a mix of tutorials. That's also why I have no clue where the problem might be, and everything I found on the internet was kinda specific for each problem, so I couldn't apply that to mine.

Thanks for your time!