diff mbox series

[bpf-next,v3,1/3] bpf: do not walk twice the map on free

Message ID 20240430-bpf-next-v3-1-27afe7f3b17c@kernel.org (mailing list archive)
State Accepted
Commit b98a5c68ccaa94e93b9e898091fe2cf21c1500e6
Delegated to: BPF
Headers show
Series bpf_wq followup series | expand

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netdev/ynl success Generated files up to date; no warnings/errors; no diff in generated;
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 931 this patch: 931
netdev/build_tools success No tools touched, skip
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netdev/verify_fixes success Fixes tag looks correct
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netdev/checkpatch warning WARNING: line length of 94 exceeds 80 columns WARNING: line length of 98 exceeds 80 columns
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netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0

Commit Message

Benjamin Tissoires April 30, 2024, 10:43 a.m. UTC 
If someone stores both a timer and a workqueue in a map, on free we
would walk it twice.
Add a check in array_map_free_timers_wq and free the timers
and workqueues if they are present.

Fixes: 246331e3f1ea ("bpf: allow struct bpf_wq to be embedded in arraymaps and hashmaps")
Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>

---

no changes in v3

no changes in v2
---
 kernel/bpf/arraymap.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

Comments

Kumar Kartikeya Dwivedi April 30, 2024, 12:37 p.m. UTC | #1 
On Tue, 30 Apr 2024 at 12:43, Benjamin Tissoires <bentiss@kernel.org> wrote:
>
> If someone stores both a timer and a workqueue in a map, on free we
> would walk it twice.
> Add a check in array_map_free_timers_wq and free the timers
> and workqueues if they are present.
>
> Fixes: 246331e3f1ea ("bpf: allow struct bpf_wq to be embedded in arraymaps and hashmaps")
> Signed-off-by: Benjamin Tissoires <bentiss@kernel.org>
>
> ---
>
> no changes in v3
>
> no changes in v2
> ---

Acked-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>

>  [...]
diff mbox series

Patch

diff --git a/kernel/bpf/arraymap.c b/kernel/bpf/arraymap.c
index 580d07b15471..feabc0193852 100644
--- a/kernel/bpf/arraymap.c
+++ b/kernel/bpf/arraymap.c
@@ -436,13 +436,14 @@  static void array_map_free_timers_wq(struct bpf_map *map)
 	/* We don't reset or free fields other than timer and workqueue
 	 * on uref dropping to zero.
 	 */
-	if (btf_record_has_field(map->record, BPF_TIMER))
-		for (i = 0; i < array->map.max_entries; i++)
-			bpf_obj_free_timer(map->record, array_map_elem_ptr(array, i));
-
-	if (btf_record_has_field(map->record, BPF_WORKQUEUE))
-		for (i = 0; i < array->map.max_entries; i++)
-			bpf_obj_free_workqueue(map->record, array_map_elem_ptr(array, i));
+	if (btf_record_has_field(map->record, BPF_TIMER | BPF_WORKQUEUE)) {
+		for (i = 0; i < array->map.max_entries; i++) {
+			if (btf_record_has_field(map->record, BPF_TIMER))
+				bpf_obj_free_timer(map->record, array_map_elem_ptr(array, i));
+			if (btf_record_has_field(map->record, BPF_WORKQUEUE))
+				bpf_obj_free_workqueue(map->record, array_map_elem_ptr(array, i));
+		}
+	}
 }
 
 /* Called when map->refcnt goes to zero, either from workqueue or from syscall */