From: Thomas Fourier <fourier.thomas@gmail.com>
Cc: "Thomas Fourier" <fourier.thomas@gmail.com>,
"Anatolij Gustschin" <agust@denx.de>,
"Madhavan Srinivasan" <maddy@linux.ibm.com>,
"Michael Ellerman" <mpe@ellerman.id.au>,
"Nicholas Piggin" <npiggin@gmail.com>,
"Christophe Leroy" <christophe.leroy@csgroup.eu>,
"Uwe Kleine-König" <u.kleine-koenig@baylibre.com>,
linuxppc-dev@lists.ozlabs.org (open list:LINUX FOR POWERPC
EMBEDDED MPC5XXX), linux-kernel@vger.kernel.org (open list)
Subject: [PATCH v2] (powerpc/512) Fix possible `dma_unmap_single()` on uninitialized pointer
Date: Tue, 10 Jun 2025 16:29:11 +0200 [thread overview]
Message-ID: <20250610142918.169540-2-fourier.thomas@gmail.com> (raw)
If the device configuration fails (if `dma_dev->device_config()`),
`sg_dma_address(&sg)` is not initialized and the jump to `err_dma_prep`
leads to calling `dma_unmap_single()` on `sg_dma_address(&sg)`.
Signed-off-by: Thomas Fourier <fourier.thomas@gmail.com>
---
arch/powerpc/platforms/512x/mpc512x_lpbfifo.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
index 9668b052cd4b..f251e0f68262 100644
--- a/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
+++ b/arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
@@ -240,10 +240,8 @@ static int mpc512x_lpbfifo_kick(void)
dma_conf.src_addr_width = DMA_SLAVE_BUSWIDTH_4_BYTES;
/* Make DMA channel work with LPB FIFO data register */
- if (dma_dev->device_config(lpbfifo.chan, &dma_conf)) {
- ret = -EINVAL;
- goto err_dma_prep;
- }
+ if (dma_dev->device_config(lpbfifo.chan, &dma_conf))
+ return -EINVAL;
sg_init_table(&sg, 1);
--
2.43.0
next reply other threads:[~2025-06-10 14:29 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-06-10 14:29 Thomas Fourier [this message]
2025-06-10 16:37 ` [PATCH v2] (powerpc/512) Fix possible `dma_unmap_single()` on uninitialized pointer Christophe Leroy
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