* [PATCH] pgo: Clean up prf_open() error paths
@ 2021-06-07 23:02 Kees Cook
0 siblings, 0 replies; only message in thread
From: Kees Cook @ 2021-06-07 23:02 UTC (permalink / raw)
To: linux-kernel
Cc: Kees Cook, Jarmo Tiitto, Sami Tolvanen, Bill Wendling,
Nathan Chancellor, Nick Desaulniers, clang-built-linux
Change coding style for prf_open() error handling paths. Additionally
fix up comments to be complete sentences with punctuation.
Signed-off-by: Kees Cook <keescook@chromium.org>
---
This is on top of Jarmo's recent fixes.
---
kernel/pgo/fs.c | 49 ++++++++++++++++++++-----------------------------
1 file changed, 20 insertions(+), 29 deletions(-)
diff --git a/kernel/pgo/fs.c b/kernel/pgo/fs.c
index 0ce0dc9caf7a..3c5aa7c2a4ce 100644
--- a/kernel/pgo/fs.c
+++ b/kernel/pgo/fs.c
@@ -234,17 +234,14 @@ static unsigned long prf_buffer_size(void)
*/
static int prf_serialize(struct prf_private_data *p, size_t buf_size)
{
- int err = 0;
void *buffer;
/* get buffer size, again. */
p->size = prf_buffer_size();
/* check for unlikely overflow. */
- if (p->size > buf_size) {
- err = -EAGAIN;
- goto out;
- }
+ if (p->size > buf_size)
+ return -EAGAIN;
buffer = p->buffer;
@@ -256,8 +253,7 @@ static int prf_serialize(struct prf_private_data *p, size_t buf_size)
prf_serialize_values(&buffer);
-out:
- return err;
+ return 0;
}
/* open() implementation for PGO. Creates a copy of the profiling data set. */
@@ -266,52 +262,47 @@ static int prf_open(struct inode *inode, struct file *file)
struct prf_private_data *data;
unsigned long flags;
size_t buf_size;
- int err = 0;
+ int err = -EINVAL;
data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data) {
- err = -ENOMEM;
- goto out_free;
- }
+ if (!data)
+ return -ENOMEM;
- /* get initial buffer size */
+ /* Get initial buffer size. */
flags = prf_lock();
data->size = prf_buffer_size();
prf_unlock(flags);
do {
- if (data->buffer)
- vfree(data->buffer);
+ vfree(data->buffer);
- /* allocate, round up to page size. */
+ /* Allocate, round up to page size. */
buf_size = PAGE_ALIGN(data->size);
data->buffer = vzalloc(buf_size);
if (!data->buffer) {
err = -ENOMEM;
- goto out_free;
+ break;
}
/*
- * try serialize and get actual
- * data length in data->size
+ * Try serialize and get actual
+ * data length in data->size.
*/
flags = prf_lock();
err = prf_serialize(data, buf_size);
prf_unlock(flags);
- /* in unlikely case, try again. */
+ /* In unlikely case, try again. */
} while (err == -EAGAIN);
- if (err)
- goto out_free;
-
- file->private_data = data;
- return 0;
+ if (err < 0) {
+ if (data)
+ vfree(data->buffer);
+ kfree(data);
+ } else {
+ file->private_data = data;
+ }
-out_free:
- if (data)
- vfree(data->buffer);
- kfree(data);
return err;
}
--
2.25.1
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