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Message-Id: <20220209184305.47983-3-sashal@kernel.org>
Date: Wed, 9 Feb 2022 13:42:49 -0500
From: Sasha Levin <sashal@...nel.org>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc: Miquel Raynal <miquel.raynal@...tlin.com>,
Alexander Aring <alex.aring@...il.com>,
Alexander Aring <aahringo@...hat.com>,
Stefan Schmidt <stefan@...enfreihafen.org>,
Sasha Levin <sashal@...nel.org>, davem@...emloft.net,
kuba@...nel.org, linux-wpan@...r.kernel.org, netdev@...r.kernel.org
Subject: [PATCH AUTOSEL 5.4 03/15] net: ieee802154: at86rf230: Stop leaking skb's
From: Miquel Raynal <miquel.raynal@...tlin.com>
[ Upstream commit e5ce576d45bf72fd0e3dc37eff897bfcc488f6a9 ]
Upon error the ieee802154_xmit_complete() helper is not called. Only
ieee802154_wake_queue() is called manually. In the Tx case we then leak
the skb structure.
Free the skb structure upon error before returning when appropriate.
As the 'is_tx = 0' cannot be moved in the complete handler because of a
possible race between the delay in switching to STATE_RX_AACK_ON and a
new interrupt, we introduce an intermediate 'was_tx' boolean just for
this purpose.
There is no Fixes tag applying here, many changes have been made on this
area and the issue kind of always existed.
Suggested-by: Alexander Aring <alex.aring@...il.com>
Signed-off-by: Miquel Raynal <miquel.raynal@...tlin.com>
Acked-by: Alexander Aring <aahringo@...hat.com>
Link: https://lore.kernel.org/r/20220125121426.848337-4-miquel.raynal@bootlin.com
Signed-off-by: Stefan Schmidt <stefan@...enfreihafen.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
drivers/net/ieee802154/at86rf230.c | 13 +++++++++++--
1 file changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/net/ieee802154/at86rf230.c b/drivers/net/ieee802154/at86rf230.c
index 7d67f41387f55..4f5ef8a9a9a87 100644
--- a/drivers/net/ieee802154/at86rf230.c
+++ b/drivers/net/ieee802154/at86rf230.c
@@ -100,6 +100,7 @@ struct at86rf230_local {
unsigned long cal_timeout;
bool is_tx;
bool is_tx_from_off;
+ bool was_tx;
u8 tx_retry;
struct sk_buff *tx_skb;
struct at86rf230_state_change tx;
@@ -343,7 +344,11 @@ at86rf230_async_error_recover_complete(void *context)
if (ctx->free)
kfree(ctx);
- ieee802154_wake_queue(lp->hw);
+ if (lp->was_tx) {
+ lp->was_tx = 0;
+ dev_kfree_skb_any(lp->tx_skb);
+ ieee802154_wake_queue(lp->hw);
+ }
}
static void
@@ -352,7 +357,11 @@ at86rf230_async_error_recover(void *context)
struct at86rf230_state_change *ctx = context;
struct at86rf230_local *lp = ctx->lp;
- lp->is_tx = 0;
+ if (lp->is_tx) {
+ lp->was_tx = 1;
+ lp->is_tx = 0;
+ }
+
at86rf230_async_state_change(lp, ctx, STATE_RX_AACK_ON,
at86rf230_async_error_recover_complete);
}
--
2.34.1
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