mirror of
https://github.com/AsahiLinux/u-boot
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54841ab50c
The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands. Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".
This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:
int main (int argc, char **argv)
{
while (--argc > 0 && **++argv == '-') {
/* ====> */ while (*++*argv) {
switch (**argv) {
case 'd':
debug++;
break;
...
default:
usage ();
}
}
}
...
}
The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell. With the modification, the compiler will prevent this with
an
error: increment of read-only location '*argv'
N.B.: The code above can be trivially rewritten like this:
while (--argc > 0 && **++argv == '-') {
char *arg = *argv;
while (*++arg) {
switch (*arg) {
...
Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
/*
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* (C) Copyright 2001
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* Erik Theisen, Wave 7 Optics, etheisen@mindspring.com
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*
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* See file CREDITS for list of people who contributed to this
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* project.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation; either version 2 of
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* the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston,
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* MA 02111-1307 USA
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*/
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#include <common.h>
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#include <config.h>
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#include <command.h>
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#include <dtt.h>
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#include <i2c.h>
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int do_dtt (cmd_tbl_t * cmdtp, int flag, int argc, char * const argv[])
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{
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int i;
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unsigned char sensors[] = CONFIG_DTT_SENSORS;
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int old_bus;
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/* switch to correct I2C bus */
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old_bus = I2C_GET_BUS();
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I2C_SET_BUS(CONFIG_SYS_DTT_BUS_NUM);
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/*
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* Loop through sensors, read
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* temperature, and output it.
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*/
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for (i = 0; i < sizeof (sensors); i++)
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printf ("DTT%d: %i C\n", i + 1, dtt_get_temp (sensors[i]));
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/* switch back to original I2C bus */
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I2C_SET_BUS(old_bus);
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return 0;
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} /* do_dtt() */
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/***************************************************/
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U_BOOT_CMD(
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dtt, 1, 1, do_dtt,
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"Read temperature from Digital Thermometer and Thermostat",
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""
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);
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