| Message ID | cc3178c2ff60f640f4d5a071d51f6b0b1db37656.1648822020.git.geert+renesas@glider.be |
|---|---|
| State | New |
| Headers | show |
| Series | mmc: renesas_sdhi: Add missing checks for the presence of quirks | expand |
On Fri, Apr 01, 2022 at 04:09:28PM +0200, Geert Uytterhoeven wrote: > When running on an system without any quirks (e.g. R-Car V3U), the > kernel crashes with a NULL pointer dereference: > > Unable to handle kernel NULL pointer dereference at virtual address 0000000000000002 > ... > Hardware name: Renesas Falcon CPU and Breakout boards based on r8a779a0 (DT) > Workqueue: events_freezable mmc_rescan > ... > Call trace: > renesas_sdhi_internal_dmac_start_dma+0x54/0x12c > tmio_process_mrq+0x124/0x274 > > Fix this by adding the missing checks for the validatity of the > priv->quirks pointer. > > Fixes: dce2ba8b2ee8cef6 ("mmc: renesas_sdhi: make 'dmac_only_one_rx' a quirk") > Fixes: d4bfa17a655c6de2 ("mmc: renesas_sdhi: make 'fixed_addr_mode' a quirk") > Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> Thanks for catching this! Reviewed-by: Wolfram Sang <wsa+renesas@sang-engineering.com> Tested-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
diff --git a/drivers/mmc/host/renesas_sdhi_internal_dmac.c b/drivers/mmc/host/renesas_sdhi_internal_dmac.c index 6dd5ade3851b2ba8..90048f74e6221add 100644 --- a/drivers/mmc/host/renesas_sdhi_internal_dmac.c +++ b/drivers/mmc/host/renesas_sdhi_internal_dmac.c @@ -374,7 +374,7 @@ renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host, struct scatterlist *sg = host->sg_ptr; u32 dtran_mode = DTRAN_MODE_BUS_WIDTH; - if (!priv->quirks->fixed_addr_mode) + if (!(priv->quirks && priv->quirks->fixed_addr_mode)) dtran_mode |= DTRAN_MODE_ADDR_MODE; if (!renesas_sdhi_internal_dmac_map(host, data, COOKIE_MAPPED)) @@ -382,7 +382,7 @@ renesas_sdhi_internal_dmac_start_dma(struct tmio_mmc_host *host, if (data->flags & MMC_DATA_READ) { dtran_mode |= DTRAN_MODE_CH_NUM_CH1; - if (priv->quirks->dma_one_rx_only && + if (priv->quirks && priv->quirks->dma_one_rx_only && test_and_set_bit(SDHI_INTERNAL_DMAC_RX_IN_USE, &global_flags)) goto force_pio_with_unmap; } else {
When running on an system without any quirks (e.g. R-Car V3U), the kernel crashes with a NULL pointer dereference: Unable to handle kernel NULL pointer dereference at virtual address 0000000000000002 ... Hardware name: Renesas Falcon CPU and Breakout boards based on r8a779a0 (DT) Workqueue: events_freezable mmc_rescan ... Call trace: renesas_sdhi_internal_dmac_start_dma+0x54/0x12c tmio_process_mrq+0x124/0x274 Fix this by adding the missing checks for the validatity of the priv->quirks pointer. Fixes: dce2ba8b2ee8cef6 ("mmc: renesas_sdhi: make 'dmac_only_one_rx' a quirk") Fixes: d4bfa17a655c6de2 ("mmc: renesas_sdhi: make 'fixed_addr_mode' a quirk") Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be> --- drivers/mmc/host/renesas_sdhi_internal_dmac.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)