Function radix_tree_insert() returns errors if the node hasn't
been initialized and added to the tree.

"kfree(node)" and return value "NULL" of node_get() help
to avoid using unclear node in other calls.

Found by Linux Verification Center (linuxtesting.org) with SVACE.

Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
Signed-off-by: Natalia Petrova <n.petrova@fintech.ru>
---
 net/qrtr/ns.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
index 1990d496fcfc..e595079c2caf 100644
--- a/net/qrtr/ns.c
+++ b/net/qrtr/ns.c
@@ -83,7 +83,10 @@ static struct qrtr_node *node_get(unsigned int node_id)
 
 	node->id = node_id;
 
-	radix_tree_insert(&nodes, node_id, node);
+	if (radix_tree_insert(&nodes, node_id, node)) {
+		kfree(node);
+		return NULL;
+	}
 
 	return node;
 }
-- 
2.34.1

Hello:

This patch was applied to netdev/net.git (master)
by Jakub Kicinski <kuba@kernel.org>:

On Wed, 25 Jan 2023 16:48:31 +0300 you wrote:
> Function radix_tree_insert() returns errors if the node hasn't
> been initialized and added to the tree.
> 
> "kfree(node)" and return value "NULL" of node_get() help
> to avoid using unclear node in other calls.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> [...]

Here is the summary with links:
  - net: qrtr: free memory on error path in radix_tree_insert()
    https://git.kernel.org/netdev/net/c/29de68c2b32c

You are awesome, thank you!
-- 
Deet-doot-dot, I am a bot.
https://korg.docs.kernel.org/patchwork/pwbot.html

On Wed, Jan 25, 2023 at 04:48:31PM +0300, Natalia Petrova wrote:
> Function radix_tree_insert() returns errors if the node hasn't
> been initialized and added to the tree.
> 
> "kfree(node)" and return value "NULL" of node_get() help
> to avoid using unclear node in other calls.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
> Signed-off-by: Natalia Petrova <n.petrova@fintech.ru>

Reviewed-by: Manivannan Sadhasivam <mani@kernel.org>

This patch should also be backported to stable kernels. Could you please add,

Cc: <stable@vger.kernel.org> # 5.7

Thanks,
Mani

> ---
>  net/qrtr/ns.c | 5 ++++-
>  1 file changed, 4 insertions(+), 1 deletion(-)
> 
> diff --git a/net/qrtr/ns.c b/net/qrtr/ns.c
> index 1990d496fcfc..e595079c2caf 100644
> --- a/net/qrtr/ns.c
> +++ b/net/qrtr/ns.c
> @@ -83,7 +83,10 @@ static struct qrtr_node *node_get(unsigned int node_id)
>  
>  	node->id = node_id;
>  
> -	radix_tree_insert(&nodes, node_id, node);
> +	if (radix_tree_insert(&nodes, node_id, node)) {
> +		kfree(node);
> +		return NULL;
> +	}
>  
>  	return node;
>  }
> -- 
> 2.34.1
> 

-- 
மணிவண்ணன் சதாசிவம்

On Wed, Jan 25, 2023 at 04:48:31PM +0300, Natalia Petrova wrote:
> Function radix_tree_insert() returns errors if the node hasn't
> been initialized and added to the tree.
> 
> "kfree(node)" and return value "NULL" of node_get() help
> to avoid using unclear node in other calls.
> 
> Found by Linux Verification Center (linuxtesting.org) with SVACE.
> 
> Fixes: 0c2204a4ad71 ("net: qrtr: Migrate nameservice to kernel from userspace")
> Signed-off-by: Natalia Petrova <n.petrova@fintech.ru>

Reviewed-by: Simon Horman <simon.horman@corigine.com>