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Subject[PATCH 01/14] stm class: Fix a double free in stm_register_device()
Date
From: Dan Carpenter <dan.carpenter@linaro.org>

The put_device(&stm->dev) call will trigger stm_device_release() which
frees "stm" so the vfree(stm) on the next line is a double free.

Fixes: 389b6699a2aa ("stm class: Fix stm device initialization order")
Signed-off-by: Dan Carpenter <dan.carpenter@linaro.org>
Reviewed-by: Amelie Delaunay <amelie.delaunay@foss.st.com>
Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
---
drivers/hwtracing/stm/core.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/hwtracing/stm/core.c b/drivers/hwtracing/stm/core.c
index 534fbefc7f6a..20895d391562 100644
--- a/drivers/hwtracing/stm/core.c
+++ b/drivers/hwtracing/stm/core.c
@@ -868,8 +868,11 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
return -ENOMEM;

stm->major = register_chrdev(0, stm_data->name, &stm_fops);
- if (stm->major < 0)
- goto err_free;
+ if (stm->major < 0) {
+ err = stm->major;
+ vfree(stm);
+ return err;
+ }

device_initialize(&stm->dev);
stm->dev.devt = MKDEV(stm->major, 0);
@@ -913,10 +916,8 @@ int stm_register_device(struct device *parent, struct stm_data *stm_data,
err_device:
unregister_chrdev(stm->major, stm_data->name);

- /* matches device_initialize() above */
+ /* calls stm_device_release() */
put_device(&stm->dev);
-err_free:
- vfree(stm);

return err;
}
--
2.43.0

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