[GIT PULL 1/4] stm class: Fix a double free of stm_source_device

From: Alexander Shishkin
Date: Tue Aug 20 2019 - 06:17:21 EST

From: Ding Xiang <dingxiang@xxxxxxxxxxxxxxxxxxxx>

In the error path of stm_source_register_device(), the kfree is
unnecessary, as the put_device() before it ends up calling
stm_source_device_release() to free stm_source_device, leading to
a double free at the outer kfree() call. Remove it.

Signed-off-by: Ding Xiang <dingxiang@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Alexander Shishkin <alexander.shishkin@xxxxxxxxxxxxxxx>
Fixes: 7bd1d4093c2fa ("stm class: Introduce an abstraction for System Trace Module devices")
Link: https://lore.kernel.org/linux-arm-kernel/1563354988-23826-1-git-send-email-dingxiang@xxxxxxxxxxxxxxxxxxxx/
Cc: stable@xxxxxxxxxxxxxxx # v4.4+
drivers/hwtracing/stm/core.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index e55b902560de..181e7ff1ec4f 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -1276,7 +1276,6 @@ int stm_source_register_device(struct device *parent,

- kfree(src);

return err;