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tty: atmel_serial: fix a potential NULL pointer dereference
commitc85be04106
upstream. In case dmaengine_prep_dma_cyclic fails, the fix returns a proper error code to avoid NULL pointer dereference. Signed-off-by: Kangjie Lu <kjlu@umn.edu> Fixes:34df42f59a
("serial: at91: add rx dma support") Acked-by: Richard Genoud <richard.genoud@gmail.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -1163,6 +1163,10 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
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sg_dma_len(&atmel_port->sg_rx)/2,
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DMA_DEV_TO_MEM,
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DMA_PREP_INTERRUPT);
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if (!desc) {
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dev_err(port->dev, "Preparing DMA cyclic failed\n");
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goto chan_err;
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}
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desc->callback = atmel_complete_rx_dma;
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desc->callback_param = port;
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atmel_port->desc_rx = desc;
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