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nexthop: Initialize extack in remove_nh_grp_entry()

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remove_nh_grp_entry() prints the extack message when a listener fails
to replace the reduced nexthop group. However, extack is not
initialized and listeners are not required to set a message when
returning an error. Neither netdevsim nor mlxsw do so when an
allocation fails, resulting in the dereference of an uninitialized
stack pointer.

Fix by zero-initializing extack, as was done in commit 6347c5314c
("nexthop: initialize extack in nh_res_bucket_migrate()").

Fixes: 833a1065ee ("nexthop: Emit a notification when a nexthop group is reduced")
Signed-off-by: Ido Schimmel <idosch@nvidia.com>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20260903080259.10378-1-idosch@nvidia.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Ido Schimmel 2026-09-03 11:02:59 +03:00 committed by Jakub Kicinski
parent fb3088dc58
commit 5bd9e4e7cd
1 changed files with 1 additions and 1 deletions
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2
net/ipv4/nexthop.c
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@ -2036,7 +2036,7 @@ remove_nh_grp_entry(struct net *net, struct nh_grp_entry *nhge,
{
struct nh_grp_entry *nhges, *new_nhges;
struct nexthop *nhp = nhge->nh_parent;
struct netlink_ext_ack extack;
struct netlink_ext_ack extack = {};
struct nexthop *nh = nhge->nh;
struct nh_group *nhg, *newg;
int i, j, err;