From: David S. Miller Date: Fri, 17 Jul 2009 17:28:19 +0000 (-0700) Subject: sparc: Fix cleanup crash in bbc_envctrl_cleanup() X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=14d87e6c399f3942d63dff41447ff08a615d9a6b;p=linux-beck.git sparc: Fix cleanup crash in bbc_envctrl_cleanup() If kthread_run() fails or never gets to run we'll have NULL or a pointer encoded error in kenvctrld_task, rather than a legitimate task pointer. So this makes bbc_envctrl_cleanup() crash as it passed this bogus pointer into kthread_stop(). Reported-by: BERTRAND Joël Signed-off-by: David S. Miller --- diff --git a/drivers/sbus/char/bbc_envctrl.c b/drivers/sbus/char/bbc_envctrl.c index 15dab96d05e3..7c815d3327f7 100644 --- a/drivers/sbus/char/bbc_envctrl.c +++ b/drivers/sbus/char/bbc_envctrl.c @@ -537,8 +537,12 @@ int bbc_envctrl_init(struct bbc_i2c_bus *bp) } if (temp_index != 0 && fan_index != 0) { kenvctrld_task = kthread_run(kenvctrld, NULL, "kenvctrld"); - if (IS_ERR(kenvctrld_task)) - return PTR_ERR(kenvctrld_task); + if (IS_ERR(kenvctrld_task)) { + int err = PTR_ERR(kenvctrld_task); + + kenvctrld_task = NULL; + return err; + } } return 0; @@ -561,7 +565,8 @@ void bbc_envctrl_cleanup(struct bbc_i2c_bus *bp) struct bbc_cpu_temperature *tp, *tpos; struct bbc_fan_control *fp, *fpos; - kthread_stop(kenvctrld_task); + if (kenvctrld_task) + kthread_stop(kenvctrld_task); list_for_each_entry_safe(tp, tpos, &bp->temps, bp_list) { list_del(&tp->bp_list);