Commit 57885276cc16 for kernel
commit 57885276cc16a2e2b76282c808a4e84cbecb3aae
Author: Paul Moses <p@1g4.org>
Date: Mon Mar 9 17:35:10 2026 +0000
net-shapers: don't free reply skb after genlmsg_reply()
genlmsg_reply() hands the reply skb to netlink, and
netlink_unicast() consumes it on all return paths, whether the
skb is queued successfully or freed on an error path.
net_shaper_nl_get_doit() and net_shaper_nl_cap_get_doit()
currently jump to free_msg after genlmsg_reply() fails and call
nlmsg_free(msg), which can hit the same skb twice.
Return the genlmsg_reply() error directly and keep free_msg
only for pre-reply failures.
Fixes: 4b623f9f0f59 ("net-shapers: implement NL get operation")
Fixes: 553ea9f1efd6 ("net: shaper: implement introspection support")
Cc: stable@vger.kernel.org
Signed-off-by: Paul Moses <p@1g4.org>
Link: https://patch.msgid.link/20260309173450.538026-2-p@1g4.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
diff --git a/net/shaper/shaper.c b/net/shaper/shaper.c
index 005bfc766e22..3fd6629cb999 100644
--- a/net/shaper/shaper.c
+++ b/net/shaper/shaper.c
@@ -759,11 +759,7 @@ int net_shaper_nl_get_doit(struct sk_buff *skb, struct genl_info *info)
if (ret)
goto free_msg;
- ret = genlmsg_reply(msg, info);
- if (ret)
- goto free_msg;
-
- return 0;
+ return genlmsg_reply(msg, info);
free_msg:
nlmsg_free(msg);
@@ -1313,10 +1309,7 @@ int net_shaper_nl_cap_get_doit(struct sk_buff *skb, struct genl_info *info)
if (ret)
goto free_msg;
- ret = genlmsg_reply(msg, info);
- if (ret)
- goto free_msg;
- return 0;
+ return genlmsg_reply(msg, info);
free_msg:
nlmsg_free(msg);