diff mbox series

[net,4/7] net: hns3: fix debugfs concurrency issue between kfree buffer and read

Message ID 20230906072018.3020671-5-shaojijie@huawei.com (mailing list archive)
State Superseded
Commit c295160b1d95e885f1af4586a221cb221d232d10
Delegated to: Netdev Maintainers
Headers show
Series There are some bugfix for the HNS3 ethernet driver | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net
netdev/fixes_present success Fixes tag present in non-next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 9 this patch: 9
netdev/cc_maintainers fail 2 blamed authors not CCed: moyufeng@huawei.com tanhuazhong@huawei.com; 2 maintainers not CCed: moyufeng@huawei.com tanhuazhong@huawei.com
netdev/build_clang success Errors and warnings before: 1353 this patch: 1353
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success Fixes tag looks correct
netdev/build_allmodconfig_warn success Errors and warnings before: 1353 this patch: 1353
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 27 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Jijie Shao Sept. 6, 2023, 7:20 a.m. UTC 
From: Hao Chen <chenhao418@huawei.com>

Now in hns3_dbg_uninit(), there may be concurrency between
kfree buffer and read, it may result in memory error.

Moving debugfs_remove_recursive() in front of kfree buffer to ensure
they don't happen at the same time.

Fixes: 5e69ea7ee2a6 ("net: hns3: refactor the debugfs process")
Signed-off-by: Hao Chen <chenhao418@huawei.com>
Signed-off-by: Jijie Shao <shaojijie@huawei.com>
---
 drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
index 8086722a56c0..b8508533878b 100644
--- a/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
+++ b/drivers/net/ethernet/hisilicon/hns3/hns3_debugfs.c
@@ -1415,9 +1415,9 @@  int hns3_dbg_init(struct hnae3_handle *handle)
 	return 0;
 
 out:
-	mutex_destroy(&handle->dbgfs_lock);
 	debugfs_remove_recursive(handle->hnae3_dbgfs);
 	handle->hnae3_dbgfs = NULL;
+	mutex_destroy(&handle->dbgfs_lock);
 	return ret;
 }
 
@@ -1425,6 +1425,9 @@  void hns3_dbg_uninit(struct hnae3_handle *handle)
 {
 	u32 i;
 
+	debugfs_remove_recursive(handle->hnae3_dbgfs);
+	handle->hnae3_dbgfs = NULL;
+
 	for (i = 0; i < ARRAY_SIZE(hns3_dbg_cmd); i++)
 		if (handle->dbgfs_buf[i]) {
 			kvfree(handle->dbgfs_buf[i]);
@@ -1432,8 +1435,6 @@  void hns3_dbg_uninit(struct hnae3_handle *handle)
 		}
 
 	mutex_destroy(&handle->dbgfs_lock);
-	debugfs_remove_recursive(handle->hnae3_dbgfs);
-	handle->hnae3_dbgfs = NULL;
 }
 
 void hns3_dbg_register_debugfs(const char *debugfs_dir_name)