This is a note to let you know that I've just added the patch titled
bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps
to the 6.3-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bpf-fix-a-memory-leak-in-the-lru-and-lru_percpu-hash-maps.patch
and it can be found in the queue-6.3 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b34ffb0c6d23583830f9327864b9c1f486003305 Mon Sep 17 00:00:00 2001
From: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
Date: Mon, 22 May 2023 15:45:58 +0000
Subject: bpf: fix a memory leak in the LRU and LRU_PERCPU hash maps
From: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
commit b34ffb0c6d23583830f9327864b9c1f486003305 upstream.
The LRU and LRU_PERCPU maps allocate a new element on update before locking the
target hash table bucket. Right after that the maps try to lock the bucket.
If this fails, then maps return -EBUSY to the caller without releasing the
allocated element. This makes the element untracked: it doesn't belong to
either of free lists, and it doesn't belong to the hash table, so can't be
re-used; this eventually leads to the permanent -ENOMEM on LRU map updates,
which is unexpected. Fix this by returning the element to the local free list
if bucket locking fails.
Fixes: 20b6cc34ea74 ("bpf: Avoid hashtab deadlock with map_locked")
Signed-off-by: Anton Protopopov <aspsk@xxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230522154558.2166815-1-aspsk@xxxxxxxxxxxxx
Signed-off-by: Martin KaFai Lau <martin.lau@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
kernel/bpf/hashtab.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)
--- a/kernel/bpf/hashtab.c
+++ b/kernel/bpf/hashtab.c
@@ -1197,7 +1197,7 @@ static long htab_lru_map_update_elem(str
ret = htab_lock_bucket(htab, b, hash, &flags);
if (ret)
- return ret;
+ goto err_lock_bucket;
l_old = lookup_elem_raw(head, hash, key, key_size);
@@ -1218,6 +1218,7 @@ static long htab_lru_map_update_elem(str
err:
htab_unlock_bucket(htab, b, hash, flags);
+err_lock_bucket:
if (ret)
htab_lru_push_free(htab, l_new);
else if (l_old)
@@ -1320,7 +1321,7 @@ static long __htab_lru_percpu_map_update
ret = htab_lock_bucket(htab, b, hash, &flags);
if (ret)
- return ret;
+ goto err_lock_bucket;
l_old = lookup_elem_raw(head, hash, key, key_size);
@@ -1343,6 +1344,7 @@ static long __htab_lru_percpu_map_update
ret = 0;
err:
htab_unlock_bucket(htab, b, hash, flags);
+err_lock_bucket:
if (l_new)
bpf_lru_push_free(&htab->lru, &l_new->lru_node);
return ret;
Patches currently in stable-queue which might be from aspsk@xxxxxxxxxxxxx are
queue-6.3/bpf-fix-a-memory-leak-in-the-lru-and-lru_percpu-hash-maps.patch
