diff mbox series

[bpf-next,02/11] bpf: Remove unnecessary call to btf_field_type_size().

Message ID 20240410004150.2917641-3-thinker.li@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Enable BPF programs to declare arrays of kptr, bpf_rb_root, and bpf_list_head. | expand

Checks

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bpf/vmtest-bpf-next-PR success PR summary
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Commit Message

Kui-Feng Lee April 10, 2024, 12:41 a.m. UTC 
field->size has been initialized by bpf_parse_fields() with the value
returned by btf_field_type_size(). Use it instead of calling
btf_field_type_size() again.

Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
---
 kernel/bpf/btf.c      | 2 +-
 kernel/bpf/verifier.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

Comments

Eduard Zingerman April 11, 2024, 10:12 p.m. UTC | #1 
On Tue, 2024-04-09 at 17:41 -0700, Kui-Feng Lee wrote:
> field->size has been initialized by bpf_parse_fields() with the value
> returned by btf_field_type_size(). Use it instead of calling
> btf_field_type_size() again.
> 
> Signed-off-by: Kui-Feng Lee <thinker.li@gmail.com>
> ---

Acked-by: Eduard Zingerman <eddyz87@gmail.com>
diff mbox series

Patch

diff --git a/kernel/bpf/btf.c b/kernel/bpf/btf.c
index 90c4a32d89ff..e71ea78a4db9 100644
--- a/kernel/bpf/btf.c
+++ b/kernel/bpf/btf.c
@@ -6672,7 +6672,7 @@  int btf_struct_access(struct bpf_verifier_log *log,
 		for (i = 0; i < rec->cnt; i++) {
 			struct btf_field *field = &rec->fields[i];
 			u32 offset = field->offset;
-			if (off < offset + btf_field_type_size(field->type) && offset < off + size) {
+			if (off < offset + field->size && offset < off + size) {
 				bpf_log(log,
 					"direct access to %s is disallowed\n",
 					btf_field_type_name(field->type));
diff --git a/kernel/bpf/verifier.c b/kernel/bpf/verifier.c
index 0d44940c12d2..86adacc5f76c 100644
--- a/kernel/bpf/verifier.c
+++ b/kernel/bpf/verifier.c
@@ -5432,7 +5432,7 @@  static int check_map_access(struct bpf_verifier_env *env, u32 regno,
 		 * this program. To check that [x1, x2) overlaps with [y1, y2),
 		 * it is sufficient to check x1 < y2 && y1 < x2.
 		 */
-		if (reg->smin_value + off < p + btf_field_type_size(field->type) &&
+		if (reg->smin_value + off < p + field->size &&
 		    p < reg->umax_value + off + size) {
 			switch (field->type) {
 			case BPF_KPTR_UNREF: