lkml.org 
[lkml]   [2017]   [Sep]   [29]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH] ASoC: rockchip: Allocate enough memory so we don't overflow routes
Date
In the recent commit d9f9c167edae ("ASoC: rockchip: Init dapm routes
dynamically") we improperly allocated memory for the card->dapm_routes
causing us to overflow the allocation on every boot. Oops.

Let's allocate the correct amount of memory. We'll also add a check
to make sure that we don't overrun memory even if we encounter some
sort of weird device tree.

Fixes: d9f9c167edae ("ASoC: rockchip: Init dapm routes dynamically")
Signed-off-by: Douglas Anderson <dianders@chromium.org>
---

sound/soc/rockchip/rk3399_gru_sound.c | 12 +++++++++++-
1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/sound/soc/rockchip/rk3399_gru_sound.c b/sound/soc/rockchip/rk3399_gru_sound.c
index 30eed83e8a13..d64fbbd50544 100644
--- a/sound/soc/rockchip/rk3399_gru_sound.c
+++ b/sound/soc/rockchip/rk3399_gru_sound.c
@@ -494,13 +494,17 @@ static int rockchip_sound_of_parse_dais(struct device *dev,
struct snd_soc_dai_link *dai;
struct snd_soc_dapm_route *routes;
int i, index;
+ int num_routes;

card->dai_link = devm_kzalloc(dev, sizeof(rockchip_dais),
GFP_KERNEL);
if (!card->dai_link)
return -ENOMEM;

- routes = devm_kzalloc(dev, sizeof(rockchip_routes),
+ num_routes = 0;
+ for (i = 0; i < ARRAY_SIZE(rockchip_routes); i++)
+ num_routes += rockchip_routes[i].num_routes;
+ routes = devm_kzalloc(dev, num_routes * sizeof(*routes),
GFP_KERNEL);
if (!routes)
return -ENOMEM;
@@ -538,6 +542,12 @@ static int rockchip_sound_of_parse_dais(struct device *dev,
dai->platform_of_node = np_cpu;
dai->cpu_of_node = np_cpu;

+ if (card->num_dapm_routes + rockchip_routes[index].num_routes >
+ num_routes) {
+ dev_err(dev, "Too many routes\n");
+ return -EINVAL;
+ }
+
memcpy(routes + card->num_dapm_routes,
rockchip_routes[index].routes,
rockchip_routes[index].num_routes * sizeof(*routes));
--
2.14.2.822.g60be5d43e6-goog
\
 
 \ /
  Last update: 2017-09-30 00:04    [W:0.045 / U:1.616 seconds]
©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site