From: trix@redhat.com
To: thomas.petazzoni@bootlin.com, davem@davemloft.net,
kuba@kernel.org, natechancellor@gmail.com,
ndesaulniers@google.com, ezequiel.garcia@free-electrons.com
Cc: netdev@vger.kernel.org, linux-kernel@vger.kernel.org,
clang-built-linux@googlegroups.com, Tom Rix <trix@redhat.com>
Subject: [PATCH] net: mvneta: fix double free of txq->buf
Date: Sat, 3 Oct 2020 11:51:21 -0700 [thread overview]
Message-ID: <20201003185121.12370-1-trix@redhat.com> (raw)
From: Tom Rix <trix@redhat.com>
clang static analysis reports this problem:
drivers/net/ethernet/marvell/mvneta.c:3465:2: warning:
Attempt to free released memory
kfree(txq->buf);
^~~~~~~~~~~~~~~
When mvneta_txq_sw_init() fails to alloc txq->tso_hdrs,
it frees without poisoning txq->buf. The error is caught
in the mvneta_setup_txqs() caller which handles the error
by cleaning up all of the txqs with a call to
mvneta_txq_sw_deinit which also frees txq->buf.
Since mvneta_txq_sw_deinit is a general cleaner, all of the
partial cleaning in mvneta_txq_sw_deinit()'s error handling
is not needed.
Fixes: 2adb719d74f6 ("net: mvneta: Implement software TSO")
Signed-off-by: Tom Rix <trix@redhat.com>
---
drivers/net/ethernet/marvell/mvneta.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)
diff --git a/drivers/net/ethernet/marvell/mvneta.c b/drivers/net/ethernet/marvell/mvneta.c
index d095718355d3..54b0bf574c05 100644
--- a/drivers/net/ethernet/marvell/mvneta.c
+++ b/drivers/net/ethernet/marvell/mvneta.c
@@ -3397,24 +3397,15 @@ static int mvneta_txq_sw_init(struct mvneta_port *pp,
txq->last_desc = txq->size - 1;
txq->buf = kmalloc_array(txq->size, sizeof(*txq->buf), GFP_KERNEL);
- if (!txq->buf) {
- dma_free_coherent(pp->dev->dev.parent,
- txq->size * MVNETA_DESC_ALIGNED_SIZE,
- txq->descs, txq->descs_phys);
+ if (!txq->buf)
return -ENOMEM;
- }
/* Allocate DMA buffers for TSO MAC/IP/TCP headers */
txq->tso_hdrs = dma_alloc_coherent(pp->dev->dev.parent,
txq->size * TSO_HEADER_SIZE,
&txq->tso_hdrs_phys, GFP_KERNEL);
- if (!txq->tso_hdrs) {
- kfree(txq->buf);
- dma_free_coherent(pp->dev->dev.parent,
- txq->size * MVNETA_DESC_ALIGNED_SIZE,
- txq->descs, txq->descs_phys);
+ if (!txq->tso_hdrs)
return -ENOMEM;
- }
/* Setup XPS mapping */
if (txq_number > 1)
--
2.18.1
next reply other threads:[~2020-10-03 18:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-03 18:51 trix [this message]
2020-10-04 22:08 ` [PATCH] net: mvneta: fix double free of txq->buf David Miller
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