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[MTD] slram: Handle negative devlength correctly 

A negative devlength won't get noticed and clean up:

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Roel Kluin 2009-01-19 00:15:13 +01:00 committed by David Woodhouse
parent 5f877607cd
commit 3afd522de8
1 changed files with 10 additions and 4 deletions
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14
drivers/mtd/devices/slram.c
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@ -267,22 +267,28 @@ static int parse_cmdline(char *devname, char *szstart, char *szlength)
if (*(szlength) != '+') {
devlength = simple_strtoul(szlength, &buffer, 0);
devlength = handle_unit(devlength, buffer) - devstart;
if (devlength < devstart)
goto err_out;
devlength -= devstart;
} else {
devlength = simple_strtoul(szlength + 1, &buffer, 0);
devlength = handle_unit(devlength, buffer);
}
T("slram: devname=%s, devstart=0x%lx, devlength=0x%lx\n",
devname, devstart, devlength);
if ((devstart < 0) || (devlength < 0) || (devlength % SLRAM_BLK_SZ != 0)) {
E("slram: Illegal start / length parameter.\n");
return(-EINVAL);
}
if (devlength % SLRAM_BLK_SZ != 0)
goto err_out;
if ((devstart = register_device(devname, devstart, devlength))){
unregister_devices();
return((int)devstart);
}
return(0);
err_out:
E("slram: Illegal length parameter.\n");
return(-EINVAL);
}
#ifndef MODULE