diff mbox series

[v1,net,2/2] geneve: Suppress list corruption splat in geneve_destroy_tunnels().

Message ID 20250217203705.40342-3-kuniyu@amazon.com (mailing list archive)
State Accepted
Commit 62fab6eef61f245dc8797e3a6a5b890ef40e8628
Delegated to: Netdev Maintainers
Headers show
Series gtp/geneve: Suppress list_del() splat during ->exit_batch_rtnl(). | expand

Checks

Context Check Description
netdev/series_format success Posting correctly formatted
netdev/tree_selection success Clearly marked for net
netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
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: 0 this patch: 0
netdev/build_tools success No tools touched, skip
netdev/cc_maintainers success CCed 6 of 6 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
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: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 14 lines checked
netdev/build_clang_rust success No Rust files in patch. Skipping build
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
netdev/contest success net-next-2025-02-18--00-00 (tests: 891)

Commit Message

Kuniyuki Iwashima Feb. 17, 2025, 8:37 p.m. UTC 
As explained in the previous patch, iterating for_each_netdev() and
gn->geneve_list during ->exit_batch_rtnl() could trigger ->dellink()
twice for the same device.

If CONFIG_DEBUG_LIST is enabled, we will see a list_del() corruption
splat in the 2nd call of geneve_dellink().

Let's remove for_each_netdev() in geneve_destroy_tunnels() and delegate
that part to default_device_exit_batch().

Fixes: 9593172d93b9 ("geneve: Fix use-after-free in geneve_find_dev().")
Signed-off-by: Kuniyuki Iwashima <kuniyu@amazon.com>
---
 drivers/net/geneve.c | 7 -------
 1 file changed, 7 deletions(-)
diff mbox series

Patch

diff --git a/drivers/net/geneve.c b/drivers/net/geneve.c
index a1f674539965..dbb3960126ee 100644
--- a/drivers/net/geneve.c
+++ b/drivers/net/geneve.c
@@ -1902,14 +1902,7 @@  static void geneve_destroy_tunnels(struct net *net, struct list_head *head)
 {
 	struct geneve_net *gn = net_generic(net, geneve_net_id);
 	struct geneve_dev *geneve, *next;
-	struct net_device *dev, *aux;
 
-	/* gather any geneve devices that were moved into this ns */
-	for_each_netdev_safe(net, dev, aux)
-		if (dev->rtnl_link_ops == &geneve_link_ops)
-			geneve_dellink(dev, head);
-
-	/* now gather any other geneve devices that were created in this ns */
 	list_for_each_entry_safe(geneve, next, &gn->geneve_list, next)
 		geneve_dellink(geneve->dev, head);
 }