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spi/topcliff_pch: Fix potential NULL dereference on allocation error

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In pch_spi_handle_dma, it doesn't check for NULL returns of kcalloc
so it would result in an Oops.

Fixes: c37f3c2749 ("spi/topcliff_pch: DMA support")
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
YueHaibing 2019-01-23 20:00:22 +08:00 committed by Mark Brown
parent bfecfd6e23
commit e902cdcb51
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GPG Key ID: 24D68B725D5487D0
1 changed files with 6 additions and 0 deletions
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6
drivers/spi/spi-topcliff-pch.c
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@ -1008,6 +1008,9 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
/* RX */
dma->sg_rx_p = kcalloc(num, sizeof(*dma->sg_rx_p), GFP_ATOMIC);
if (!dma->sg_rx_p)
return;
sg_init_table(dma->sg_rx_p, num); /* Initialize SG table */
/* offset, length setting */
sg = dma->sg_rx_p;
@ -1068,6 +1071,9 @@ static void pch_spi_handle_dma(struct pch_spi_data *data, int *bpw)
}
dma->sg_tx_p = kcalloc(num, sizeof(*dma->sg_tx_p), GFP_ATOMIC);
if (!dma->sg_tx_p)
return;
sg_init_table(dma->sg_tx_p, num); /* Initialize SG table */
/* offset, length setting */
sg = dma->sg_tx_p;