| Message ID | 1554082674-2049-2-git-send-email-wen.yang99@zte.com.cn (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [1/7] cpufreq: ap806: fix possible object reference leak | expand |
> @@ -132,6 +132,7 @@ static int __init armada_8k_cpufreq_init(void) > of_node_put(node); > return -ENODEV; > } > + of_node_put(node); > > nb_cpus = num_possible_cpus(); > freq_tables = kcalloc(nb_cpus, sizeof(*freq_tables), GFP_KERNEL); Would another null pointer check be safer for this memory allocation? https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/cpufreq/armada-8k-cpufreq.c?id=05d08e2995cbe6efdb993482ee0d38a77040861a#n137 Regards, Markus
> @@ -132,6 +132,7 @@ static int __init armada_8k_cpufreq_init(void) > of_node_put(node); > return -ENODEV; > } > + of_node_put(node); > > nb_cpus = num_possible_cpus(); > freq_tables = kcalloc(nb_cpus, sizeof(*freq_tables), GFP_KERNEL); Would another null pointer check be safer for this memory allocation? https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git/tree/drivers/cpufreq/armada-8k-cpufreq.c?id=05d08e2995cbe6efdb993482ee0d38a77040861a#n137 Regards, Markus
On 01-04-19, 09:37, Wen Yang wrote: > The call to of_find_compatible_node returns a node pointer with refcount > incremented thus it must be explicitly decremented after the last > usage. > > Detected by coccinelle with the following warnings: > ./drivers/cpufreq/armada-8k-cpufreq.c:187:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 130, but without a corresponding object release within this function. > ./drivers/cpufreq/armada-8k-cpufreq.c:191:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 130, but without a corresponding object release within this function. > > Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> > Cc: Jason Cooper <jason@lakedaemon.net> > Cc: Andrew Lunn <andrew@lunn.ch> > Cc: Gregory Clement <gregory.clement@bootlin.com> > Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> > Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> > Cc: Viresh Kumar <viresh.kumar@linaro.org> > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-pm@vger.kernel.org > Cc: linux-kernel@vger.kernel.org > --- > drivers/cpufreq/armada-8k-cpufreq.c | 1 + > 1 file changed, 1 insertion(+) I haven't received the cover-letter and patch 4/7 (because the tags in that commit were incorrect). I have applied all the 7 patches to my cpufreq tree though. Thanks.
diff --git a/drivers/cpufreq/armada-8k-cpufreq.c b/drivers/cpufreq/armada-8k-cpufreq.c index b3f4bd6..988ebc3 100644 --- a/drivers/cpufreq/armada-8k-cpufreq.c +++ b/drivers/cpufreq/armada-8k-cpufreq.c @@ -132,6 +132,7 @@ static int __init armada_8k_cpufreq_init(void) of_node_put(node); return -ENODEV; } + of_node_put(node); nb_cpus = num_possible_cpus(); freq_tables = kcalloc(nb_cpus, sizeof(*freq_tables), GFP_KERNEL);
The call to of_find_compatible_node returns a node pointer with refcount incremented thus it must be explicitly decremented after the last usage. Detected by coccinelle with the following warnings: ./drivers/cpufreq/armada-8k-cpufreq.c:187:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 130, but without a corresponding object release within this function. ./drivers/cpufreq/armada-8k-cpufreq.c:191:1-7: ERROR: missing of_node_put; acquired a node pointer with refcount incremented on line 130, but without a corresponding object release within this function. Signed-off-by: Wen Yang <wen.yang99@zte.com.cn> Cc: Jason Cooper <jason@lakedaemon.net> Cc: Andrew Lunn <andrew@lunn.ch> Cc: Gregory Clement <gregory.clement@bootlin.com> Cc: Sebastian Hesselbarth <sebastian.hesselbarth@gmail.com> Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net> Cc: Viresh Kumar <viresh.kumar@linaro.org> Cc: linux-arm-kernel@lists.infradead.org Cc: linux-pm@vger.kernel.org Cc: linux-kernel@vger.kernel.org --- drivers/cpufreq/armada-8k-cpufreq.c | 1 + 1 file changed, 1 insertion(+)