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cmd: fdt: Check argc before accessing argv in fdt memory

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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>
This commit is contained in:
Marek Vasut 2023-03-02 04:08:19 +01:00 committed by Simon Glass
parent 9d019f5106
commit e023b8601e
1 changed files with 4 additions and 0 deletions
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4
cmd/fdt.c
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@ -611,6 +611,10 @@ static int do_fdt(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
} else if (strncmp(argv[1], "me", 2) == 0) {
uint64_t addr, size;
int err;
if (argc != 4)
return CMD_RET_USAGE;
addr = simple_strtoull(argv[2], NULL, 16);
size = simple_strtoull(argv[3], NULL, 16);
err = fdt_fixup_memory(working_fdt, addr, size);