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cmd: fdt: Check argc before accessing argv in fdt memory
On case 'fdt memory' is invoked without parameters, argv[2]/argv[3] is not valid and this command would SEGFAULT in sandbox environment. Add missing argc test to avoid the crash and rather print usage help message. Signed-off-by: Marek Vasut <marek.vasut+renesas@mailbox.org> Reviewed-by: Simon Glass <sjg@chromium.org>
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@ -611,6 +611,10 @@ static int do_fdt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
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} else if (strncmp(argv[1], "me", 2) == 0) {
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uint64_t addr, size;
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int err;
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if (argc != 4)
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return CMD_RET_USAGE;
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addr = simple_strtoull(argv[2], NULL, 16);
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size = simple_strtoull(argv[3], NULL, 16);
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err = fdt_fixup_memory(working_fdt, addr, size);
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