fix integer overflow issue for i386-pc

2185556d · longpanda · GitHub · 97be7b8b · 2185556d
Unverified Commit 2185556d authored Feb 06, 2021 by longpanda Committed by GitHub Feb 06, 2021
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GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy.c GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy.c +1 -1

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--- a/GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy.c
+++ b/GRUB2/MOD_SRC/grub-2.04/grub-core/ventoy/ventoy.c
@@ -553,7 +553,7 @@ static grub_err_t ventoy_cmd_mod(grub_extcmd_context_t ctxt, int argc, char **ar
    value1 = grub_strtoull(args[0], NULL, 10);
    value2 = grub_strtoull(args[1], NULL, 10);

-    grub_snprintf(buf, sizeof(buf), "%llu", (value1 % value2));
+    grub_snprintf(buf, sizeof(buf), "%llu", (value1 & (value2 - 1)));
    grub_env_set(args[2], buf);

    VENTOY_CMD_RETURN(GRUB_ERR_NONE);