diff options
| author | Henrique de Moraes Holschuh <hmh@hmh.eng.br> | 2007-11-18 09:18:29 -0200 |
|---|---|---|
| committer | Len Brown <len.brown@intel.com> | 2007-11-19 16:10:04 -0500 |
| commit | 59f91ff11e594913a5b3c03a4707fdf02338c8df (patch) | |
| tree | 112aedb786b0785972f55853157ebe4752fc6265 /drivers/misc | |
| parent | 4273af8d08c823d5898a2b1c2d0f25b4a8b9eaee (diff) | |
| download | linux-59f91ff11e594913a5b3c03a4707fdf02338c8df.tar.gz linux-59f91ff11e594913a5b3c03a4707fdf02338c8df.tar.bz2 linux-59f91ff11e594913a5b3c03a4707fdf02338c8df.zip | |
ACPI: thinkpad-acpi: fix oops when a module parameter has no value
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>
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/thinkpad_acpi.c | 8 |
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/misc/thinkpad_acpi.c b/drivers/misc/thinkpad_acpi.c index 8c9430775285..ab23a3221585 100644 --- a/drivers/misc/thinkpad_acpi.c +++ b/drivers/misc/thinkpad_acpi.c @@ -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) |