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authorKrzysztof Mazur <krzysiek@podlesie.net>2013-01-12 02:20:09 +0400
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2013-01-12 02:20:09 +0400
commit392370e7aa387185349946d29a0e17b918e51ae6 (patch)
tree289075fd7ac72313271792c9866380511ba5b24f /drivers/cpuidle/sysfs.c
parent9931faca02c604c22335f5a935a501bb2ace6e20 (diff)
downloadlinux-392370e7aa387185349946d29a0e17b918e51ae6.tar.xz
cpuidle: fix number of initialized/destroyed states
Commit bf4d1b5ddb78f86078ac6ae0415802d5f0c68f92 (cpuidle: support multiple drivers) changed the number of initialized state kobjects in cpuidle_add_state_sysfs() from device->state_count to drv->state_count, but left device->state_count in cpuidle_remove_state_sysfs(). The values of these two fields may be different, in which case a NULL pointer dereference may happen in cpuidle_remove_state_sysfs(), for example. Fix this problem by making cpuidle_add_state_sysfs() use device->state_count too (which restores the original behavior of it). [rjw: Changelog] Signed-off-by: Krzysztof Mazur <krzysiek@podlesie.net> Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpuidle/sysfs.c')
-rw-r--r--drivers/cpuidle/sysfs.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 340942946106..428754af6236 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -374,7 +374,7 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
/* state statistics */
- for (i = 0; i < drv->state_count; i++) {
+ for (i = 0; i < device->state_count; i++) {
kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
if (!kobj)
goto error_state;