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Date: Wed, 2 Oct 2013 21:09:21 -0700 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-kernel@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>, stable@...r.kernel.org, jwboyer@...oraproject.org, Guenter Roeck <linux@...ck-us.net>, Henrik Rydberg <rydberg@...omail.se> Subject: [ 55/57] hwmon: (applesmc) Check key count before proceeding 3.11-stable review patch. If anyone has any objections, please let me know. ------------------ From: Henrik Rydberg <rydberg@...omail.se> 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@...oraproject.org> Suggested-by: Guenter Roeck <linux@...ck-us.net> Signed-off-by: Henrik Rydberg <rydberg@...omail.se> Signed-off-by: Guenter Roeck <linux@...ck-us.net> Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org> --- drivers/hwmon/applesmc.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) --- 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) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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