diff options
| author | Henrik Rydberg <rydberg@euromail.se> | 2013-09-26 08:33:16 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-10-05 07:13:12 -0700 |
| commit | 332769e13b075c82ae7b9f79be29506f8c6aceb2 (patch) | |
| tree | bf4b30ebf211f38949cad43daa102a3c1fb2c372 /drivers/hwmon | |
| parent | 37482f9cfb0269e082a817f31ad2a5f0204163f9 (diff) | |
| download | lwn-332769e13b075c82ae7b9f79be29506f8c6aceb2.tar.gz lwn-332769e13b075c82ae7b9f79be29506f8c6aceb2.zip | |
hwmon: (applesmc) Check key count before proceeding
commit 5f4513864304672e6ea9eac60583eeac32e679f2 upstream.
After reports from Chris and Josh Boyer of a rare crash in applesmc,
Guenter pointed at the initialization problem fixed below. The patch
has not been verified to fix the crash, but should be applied
regardless.
Reported-by: <jwboyer@fedoraproject.org>
Suggested-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Henrik Rydberg <rydberg@euromail.se>
Signed-off-by: Guenter Roeck <linux@roeck-us.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwmon')
| -rw-r--r-- | drivers/hwmon/applesmc.c | 11 |
1 files changed, 10 insertions, 1 deletions
diff --git a/drivers/hwmon/applesmc.c b/drivers/hwmon/applesmc.c index 62c2e32e25ef..98814d12a604 100644 --- a/drivers/hwmon/applesmc.c +++ b/drivers/hwmon/applesmc.c @@ -525,16 +525,25 @@ static int applesmc_init_smcreg_try(void) { struct applesmc_registers *s = &smcreg; bool left_light_sensor, right_light_sensor; + unsigned int count; u8 tmp[1]; int ret; if (s->init_complete) return 0; - ret = read_register_count(&s->key_count); + ret = read_register_count(&count); if (ret) return ret; + if (s->cache && s->key_count != count) { + pr_warn("key count changed from %d to %d\n", + s->key_count, count); + kfree(s->cache); + s->cache = NULL; + } + s->key_count = count; + if (!s->cache) s->cache = kcalloc(s->key_count, sizeof(*s->cache), GFP_KERNEL); if (!s->cache) |