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ACPI: thinkpad-acpi: fix oops when a module parameter has no value

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set_ibm_param() could OOPS with a NULL pointer derreference if one did not give
any values for a module parameter it handles.  This would, of course, cause all
sort of trouble for future modprobing and require a reboot to clean up
properly.

Fix it by returning -EINVAL if no values are given for the parameter, and also
avoid any nastyness from BUG_ON while at it.

How to reproduce: modprobe thinkpad-acpi brightness

Signed-off-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br>
Tested-by: Mike Kershaw <dragorn@kismetwireless.net>
Signed-off-by: Len Brown <len.brown@intel.com>
This commit is contained in:
Henrique de Moraes Holschuh 2007-11-18 09:18:29 -02:00 committed by Len Brown
parent 4273af8d08
commit 59f91ff11e
1 changed files with 7 additions and 1 deletions
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8
drivers/misc/thinkpad_acpi.c
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@ -4817,9 +4817,15 @@ static int __init set_ibm_param(const char *val, struct kernel_param *kp)
unsigned int i;
struct ibm_struct *ibm;
if (!kp || !kp->name || !val)
return -EINVAL;
for (i = 0; i < ARRAY_SIZE(ibms_init); i++) {
ibm = ibms_init[i].data;
BUG_ON(ibm == NULL);
WARN_ON(ibm == NULL);
if (!ibm || !ibm->name)
continue;
if (strcmp(ibm->name, kp->name) == 0 && ibm->write) {
if (strlen(val) > sizeof(ibms_init[i].param) - 2)