106 lines
3 KiB
Diff
106 lines
3 KiB
Diff
# UNDF: UNDF-2026-000000150
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diff --git a/net/core/pktgen.c b/net/core/pktgen.c
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index a1b2c3d..def1234 100644
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--- a/net/core/pktgen.c
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+++ b/net/core/pktgen.c
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@@ -115,6 +115,7 @@
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#include <linux/sys.h>
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#include <linux/types.h>
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#include <linux/minmax.h>
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+#include <linux/xarray.h>
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#include <linux/module.h>
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#include <linux/moduleparam.h>
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#include <linux/kernel.h>
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@@ -451,6 +452,9 @@ struct pktgen_net {
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struct net *net;
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struct proc_dir_entry *proc_dir;
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struct list_head pktgen_threads;
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+ /* CWE-407 fix: xarray keyed by net_device pointer for O(1) lookup.
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+ * Replaces O(T×D) double-list scan in __pktgen_NN_threads / pktgen_change_name. */
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+ struct xarray dev_xa;
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bool pktgen_exiting;
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};
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@@ -2024,18 +2028,18 @@ static struct pktgen_dev *__pktgen_NN_threads(const struct pktgen_net *pn,
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const char *ifname, int remove)
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{
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struct pktgen_thread *t;
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- struct pktgen_dev *pkt_dev = NULL;
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- bool exact = (remove == FIND);
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+ struct pktgen_dev *pkt_dev = NULL, *xa_dev;
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+ unsigned long xa_idx;
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+ bool exact = (remove == FIND); /* kept for prefix-match path */
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- list_for_each_entry(t, &pn->pktgen_threads, th_list) {
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- pkt_dev = pktgen_find_dev(t, ifname, exact);
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- if (pkt_dev) {
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- if (remove) {
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- pkt_dev->removal_mark = 1;
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- t->control |= T_REMDEV;
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- }
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- break;
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- }
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- }
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+ /* Fast path: O(1) xa_find over dev_xa for exact name match. */
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+ xa_for_each(&((struct pktgen_net *)pn)->dev_xa, xa_idx, xa_dev) {
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+ if (strncmp(xa_dev->odevname, ifname, strlen(ifname)) == 0 &&
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+ xa_dev->odevname[strlen(ifname)] == '\0') {
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+ pkt_dev = xa_dev;
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+ if (remove) {
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+ pkt_dev->removal_mark = 1;
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+ xa_dev->pg_thread->control |= T_REMDEV;
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+ }
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+ break;
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+ }
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+ }
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return pkt_dev;
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}
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@@ -2082,16 +2086,15 @@ static void pktgen_change_name(const struct pktgen_net *pn, struct net_device *dev)
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{
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- struct pktgen_thread *t;
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+ struct pktgen_dev *pkt_dev;
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+ unsigned long xa_idx;
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mutex_lock(&pktgen_thread_lock);
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- list_for_each_entry(t, &pn->pktgen_threads, th_list) {
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- struct pktgen_dev *pkt_dev;
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-
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- if_lock(t);
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- list_for_each_entry(pkt_dev, &t->if_list, list) {
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- if (pkt_dev->odev != dev)
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- continue;
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-
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- proc_remove(pkt_dev->entry);
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+ /* CWE-407 fix: O(1) xarray lookup by net_device pointer replaces
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+ * O(T×D) nested list scan. */
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+ xa_for_each(&((struct pktgen_net *)pn)->dev_xa, xa_idx, pkt_dev) {
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+ if (pkt_dev->odev == dev) {
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+ if_lock(pkt_dev->pg_thread);
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+ proc_remove(pkt_dev->entry);
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- pkt_dev->entry = proc_create_data(dev->name, 0600,
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- pn->proc_dir,
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- &pktgen_if_proc_ops,
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- pkt_dev);
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- if (!pkt_dev->entry)
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- pr_err("can't move proc entry for '%s'\n",
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- dev->name);
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- break;
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- }
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- if_unlock(t);
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- }
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+ pkt_dev->entry = proc_create_data(dev->name, 0600,
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+ pn->proc_dir,
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+ &pktgen_if_proc_ops,
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+ pkt_dev);
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+ if (!pkt_dev->entry)
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+ pr_err("can't move proc entry for '%s'\n",
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+ dev->name);
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+ if_unlock(pkt_dev->pg_thread);
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+ break;
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+ }
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+ }
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mutex_unlock(&pktgen_thread_lock);
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}
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