[PATCH] net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()

[PATCH] net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()

[Xin Xiong]

The issue happens on some error handling paths. When the function
fails to grab the object `xprt`, it simply returns 0, forgetting to
decrease the reference count of another object `xps`, which is
increased by rpc_sysfs_xprt_kobj_get_xprt_switch(), causing refcount
leaks. Also, the function forgets to check whether `xps` is valid
before using it, which may result in NULL-dereferencing issues.

Fix it by adding proper error handling code when either `xprt` or
`xps` is NULL.

Fixes: 5b7eb78486cd ("SUNRPC: take a xprt offline using sysfs")
Signed-off-by: Xin Xiong <xiongx18@fudan.edu.cn>
Signed-off-by: Xin Tan <tanxin.ctf@gmail.com>
---
 net/sunrpc/sysfs.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/net/sunrpc/sysfs.c b/net/sunrpc/sysfs.c
index a3a2f8aeb80e..d1a15c6d3fd9 100644
--- a/net/sunrpc/sysfs.c
+++ b/net/sunrpc/sysfs.c
@@ -291,8 +291,10 @@ static ssize_t rpc_sysfs_xprt_state_change(struct kobject *kobj,
 	int offline = 0, online = 0, remove = 0;
 	struct rpc_xprt_switch *xps = rpc_sysfs_xprt_kobj_get_xprt_switch(kobj);
 
-	if (!xprt)
-		return 0;
+	if (!xprt || !xps) {
+		count = 0;
+		goto out_put;
+	}
 
 	if (!strncmp(buf, "offline", 7))
 		offline = 1;
-- 
2.25.1

Re: [PATCH] net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()

[patchwork-bot+netdevbpf]

Hello:

This patch was applied to netdev/net.git (master)
by David S. Miller <davem@davemloft.net>:

On Wed, 10 Aug 2022 23:29:13 +0800 you wrote:
> The issue happens on some error handling paths. When the function
> fails to grab the object `xprt`, it simply returns 0, forgetting to
> decrease the reference count of another object `xps`, which is
> increased by rpc_sysfs_xprt_kobj_get_xprt_switch(), causing refcount
> leaks. Also, the function forgets to check whether `xps` is valid
> before using it, which may result in NULL-dereferencing issues.
> 
> [...]

Here is the summary with links:
  - net/sunrpc: fix potential memory leaks in rpc_sysfs_xprt_state_change()
    https://git.kernel.org/netdev/net/c/bfc48f1b0505

You are awesome, thank you!
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