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stm class: Fix device leak in open error path

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Make sure to drop the reference taken by class_find_device() also on
allocation errors in open().

Signed-off-by: Johan Hovold <johan@kernel.org>
Fixes: 7bd1d4093c ("stm class: Introduce an abstraction for...")
Cc: stable@vger.kernel.org # v4.6+
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
This commit is contained in:
Johan Hovold 2016-11-18 14:17:31 +02:00 committed by Alexander Shishkin
parent a25f0944ba
commit a0ebf519b8
1 changed files with 5 additions and 3 deletions
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8
drivers/hwtracing/stm/core.c
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@ -361,7 +361,7 @@ static int stm_char_open(struct inode *inode, struct file *file)
struct stm_file *stmf;
struct device *dev;
unsigned int major = imajor(inode);
int err = -ENODEV;
int err = -ENOMEM;
dev = class_find_device(&stm_class, NULL, &major, major_match);
if (!dev)
@ -369,8 +369,9 @@ static int stm_char_open(struct inode *inode, struct file *file)
stmf = kzalloc(sizeof(*stmf), GFP_KERNEL);
if (!stmf)
return -ENOMEM;
goto err_put_device;
err = -ENODEV;
stm_output_init(&stmf->output);
stmf->stm = to_stm_device(dev);
@ -382,9 +383,10 @@ static int stm_char_open(struct inode *inode, struct file *file)
return nonseekable_open(inode, file);
err_free:
kfree(stmf);
err_put_device:
/* matches class_find_device() above */
put_device(dev);
kfree(stmf);
return err;
}