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spi: davinci: Fix use-after-free on unbind

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commit 373afef350a93519b4b8d636b0895da8650b714b upstream.

davinci_spi_remove() accesses the driver's private data after it's been
freed with spi_master_put().

Fix by moving the spi_master_put() to the end of the function.

Fixes: fe5fd25409 ("spi: davinci: Use dma_request_chan() for requesting DMA channel")
Signed-off-by: Lukas Wunner <lukas@wunner.de>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Cc: <stable@vger.kernel.org> # v4.7+
Link: https://lore.kernel.org/r/412f7eb1cf8990e0a3a2153f4c577298deab623e.1607286887.git.lukas@wunner.de
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner
2020-12-07 09:17:01 +01:00
committed by Greg Kroah-Hartman
parent f9433449a7
commit 9c8ef3bfd1
1 changed files with 1 additions and 1 deletions
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2
drivers/spi/spi-davinci.c
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@@ -1086,13 +1086,13 @@ static int davinci_spi_remove(struct platform_device *pdev)
spi_bitbang_stop(&dspi->bitbang); spi_bitbang_stop(&dspi->bitbang);
clk_disable_unprepare(dspi->clk); clk_disable_unprepare(dspi->clk);
spi_master_put(master);
if (dspi->dma_rx) { if (dspi->dma_rx) {
dma_release_channel(dspi->dma_rx); dma_release_channel(dspi->dma_rx);
dma_release_channel(dspi->dma_tx); dma_release_channel(dspi->dma_tx);
} }
spi_master_put(master);
return 0; return 0;
} }