swaponoff: prevent arithmetic overflow (spotted by Paul Fox <pgf@brightstareng.com>)

diff --git a/util-linux/swaponoff.c b/util-linux/swaponoff.c
index 6858d2619c784d849bf77e940ff194681faae063..48f6f4e0bf979438ca7b9bd5d3cfbc2feeb18eaf 100644 (file)
--- a/util-linux/swaponoff.c
+++ b/util-linux/swaponoff.c
@@ -21,7 +21,7 @@ static int swap_enable_disable(char *device)
 #if ENABLE_DESKTOP
        /* test for holes */
        if (S_ISREG(st.st_mode))
-               if (st.st_blocks * 512 < st.st_size)
+               if (st.st_blocks * (off_t)512 < st.st_size)
                        bb_error_msg("warning: swap file has holes");
 #endif