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intel_th: msu: Release resources on read error

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Right now, reading from msc character device will leak its's user count
on read error.

This patch makes sure resources are released when there is no data left
to read from the buffer.

Signed-off-by: Laurent FERT <laurent.fert@intel.com>
Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Laurent FERT 2016-02-15 19:11:57 +02:00 committed by Greg Kroah-Hartman
parent e4eca2a1c7
commit 2bed074aad
1 changed files with 4 additions and 5 deletions
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9
drivers/hwtracing/intel_th/msu.c
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@ -1112,12 +1112,11 @@ static ssize_t intel_th_msc_read(struct file *file, char __user *buf,
size = msc->nr_pages << PAGE_SHIFT;
if (!size)
return 0;
if (off >= size) {
len = 0;
goto put_count;
}
if (off >= size)
goto put_count;
if (off + len >= size)
len = size - off;