[PATCH net-next v1 1/7] net: hsr: constify hsr_ops and prp_ops protocol operation structures

luka.gejak
2026-03-24T14:46:56Z

The hsr_ops and prp_ops structures are assigned to hsr->proto_ops during
device initialization and are never modified at runtime. Declaring them
as const allows the compiler to place these structures in read-only
memory, which improves security by preventing accidental or malicious
modification of the function pointers they contain.

The proto_ops field in struct hsr_priv is also updated to a const
pointer to maintain type consistency.

Signed-off-by: Luka Gejak <luka.gejak@linux.dev>
---
net/hsr/hsr_device.c | 4 ++--
net/hsr/hsr_main.h | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/net/hsr/hsr_device.c b/net/hsr/hsr_device.c
index 5c3eca2235ce..90236028817d 100644
--- a/net/hsr/hsr_device.c
+++ b/net/hsr/hsr_device.c
@@ -616,7 +616,7 @@ static const struct device_type hsr_type = {
.name = "hsr",
};

-static struct hsr_proto_ops hsr_ops = {
+static const struct hsr_proto_ops hsr_ops = {
.send_sv_frame = send_hsr_supervision_frame,
.create_tagged_frame = hsr_create_tagged_frame,
.get_untagged_frame = hsr_get_untagged_frame,
@@ -626,7 +626,7 @@ static struct hsr_proto_ops hsr_ops = {
.register_frame_out = hsr_register_frame_out,
};

-static struct hsr_proto_ops prp_ops = {
+static const struct hsr_proto_ops prp_ops = {
.send_sv_frame = send_prp_supervision_frame,
.create_tagged_frame = prp_create_tagged_frame,
.get_untagged_frame = prp_get_untagged_frame,
diff --git a/net/hsr/hsr_main.h b/net/hsr/hsr_main.h
index 33b0d2460c9b..134e4f3fff60 100644
--- a/net/hsr/hsr_main.h
+++ b/net/hsr/hsr_main.h
@@ -202,7 +202,7 @@ struct hsr_priv {
enum hsr_version prot_version; /* Indicate if HSRv0, HSRv1 or PRPv1 */
spinlock_t seqnr_lock; /* locking for sequence_nr */
spinlock_t list_lock; /* locking for node list */
- struct hsr_proto_ops *proto_ops;
+ const struct hsr_proto_ops *proto_ops;
#define PRP_LAN_ID 0x5 /* 0x1010 for A and 0x1011 for B. Bit 0 is set
* based on SLAVE_A or SLAVE_B
*/
--
2.53.0