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* [PATCH] infiniband: hfi1: fix memory leaks
@ 2019-08-18 18:54 Wenwen Wang
  2019-08-19 12:03 ` Leon Romanovsky
                   ` (2 more replies)
  0 siblings, 3 replies; 4+ messages in thread
From: Wenwen Wang @ 2019-08-18 18:54 UTC (permalink / raw)
  To: Wenwen Wang
  Cc: Mike Marciniszyn, Dennis Dalessandro, Doug Ledford,
	Jason Gunthorpe, linux-rdma, linux-kernel

In fault_opcodes_write(), 'data' is allocated through kcalloc(). However,
it is not deallocated in the following execution if an error occurs,
leading to memory leaks. To fix this issue, introduce the 'free_data' label
to free 'data' before returning the error.

Signed-off-by: Wenwen Wang <wenwen@cs.uga.edu>
---
 drivers/infiniband/hw/hfi1/fault.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/fault.c b/drivers/infiniband/hw/hfi1/fault.c
index 93613e5..a999183 100644
--- a/drivers/infiniband/hw/hfi1/fault.c
+++ b/drivers/infiniband/hw/hfi1/fault.c
@@ -141,12 +141,14 @@ static ssize_t fault_opcodes_write(struct file *file, const char __user *buf,
 	if (!data)
 		return -ENOMEM;
 	copy = min(len, datalen - 1);
-	if (copy_from_user(data, buf, copy))
-		return -EFAULT;
+	if (copy_from_user(data, buf, copy)) {
+		ret = -EFAULT;
+		goto free_data;
+	}
 
 	ret = debugfs_file_get(file->f_path.dentry);
 	if (unlikely(ret))
-		return ret;
+		goto free_data;
 	ptr = data;
 	token = ptr;
 	for (ptr = data; *ptr; ptr = end + 1, token = ptr) {
@@ -195,6 +197,7 @@ static ssize_t fault_opcodes_write(struct file *file, const char __user *buf,
 	ret = len;
 
 	debugfs_file_put(file->f_path.dentry);
+free_data:
 	kfree(data);
 	return ret;
 }
-- 
2.7.4


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2019-08-18 18:54 [PATCH] infiniband: hfi1: fix memory leaks Wenwen Wang
2019-08-19 12:03 ` Leon Romanovsky
2019-08-19 13:11 ` Dennis Dalessandro
2019-08-20 17:26 ` Doug Ledford

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