mem md: bail out without arguments
Without arguments the 'md' command defaults to show address 0 which likely results in a NULL pointer exception, so only three keystrokes are necessary to crash barebox. Show usage instead if 'md' is invoked without arguments, so that it at least requires an address to be given to crash barebox. This increases the stability of barebox by 66%. Hurray! Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
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@ -180,6 +180,8 @@ static int do_mem_md(int argc, char *argv[])
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}
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if (size == ~0)
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size = 0x100;
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} else {
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return COMMAND_ERROR_USAGE;
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}
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fd = open_and_lseek(filename, mode | O_RDONLY, start);
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