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(powerpc/512) Fix possible dma_unmap_single() on uninitialized pointer

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[ Upstream commit 760b9b4f6de9a33ca56a05f950cabe82138d25bd ]

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>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250610142918.169540-2-fourier.thomas@gmail.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Thomas Fourier 2025-06-10 16:29:11 +02:00 • committed by Greg Kroah-Hartman
commit dca836a04b
1 changed files with 2 additions and 4 deletions
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6
arch/powerpc/platforms/512x/mpc512x_lpbfifo.c
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@ -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);