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linux/drivers/dma
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Andy Shevchenko b28de385b7 dmaengine: dmatest: Check list for emptiness before access its last entry 
After writing a garbage to the channel we get an Oops in dmatest_chan_set()
due to access to last entry in the empty list.

[  212.670672] BUG: unable to handle page fault for address: fffffff000000020
[  212.677562] #PF: supervisor read access in kernel mode
[  212.682702] #PF: error_code(0x0000) - not-present page
...
[  212.710074] RIP: 0010:dmatest_chan_set+0x149/0x2d0 [dmatest]
[  212.715739] Code: e8 cc f9 ff ff 48 8b 1d 0d 55 00 00 48 83 7b 10 00 0f 84 63 01 00 00 48 c7 c7 d0 65 4d c0 e8 ee 4a f5 e1 48 89 c6 48 8b 43 10 <48> 8b 40 20 48 8b 78 58 48 85 ff 0f 84 f5 00 00 00 e8 b1 41 f5 e1

Fix this by checking list for emptiness before accessing its last entry.

Fixes: d53513d5dc28 ("dmaengine: dmatest: Add support for multi channel testing")
Cc: Vladimir Murzin <vladimir.murzin@arm.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Tested-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Link: https://lore.kernel.org/r/20200922115847.30100-2-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
2020-09-22 20:18:41 +05:30
..
bestcomm
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
dw
dmaengine: dw: Add DMA-channels mask cell support
2020-08-17 11:58:31 +05:30
dw-axi-dmac
dmaengine: virt-dma: Add missing locking
2019-12-26 10:04:18 +05:30
dw-edma
dmaengine: dw-edma: Fix Using plain integer as NULL pointer in dw-edma-v0-debugfs.c
2020-09-18 12:42:33 +05:30
fsl-dpaa2-qdma
dmaengine: fsl-dpaa2-qdma: remove set but not used variable 'dpaa2_qdma'
2020-03-06 19:04:55 +05:30
hsu
dmaengine updates for v5.3-rc1
2019-07-17 09:55:43 -07:00
idxd
Linux 5.9-rc4
2020-09-11 17:45:36 +05:30
ioat
dmaengine: ioat: Make two symbols static
2020-09-18 12:31:37 +05:30
ipu
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
mediatek
dmaengine: mediatek: simplify the return expression of mtk_uart_apdma_runtime_resume()
2020-09-18 12:32:37 +05:30
ppc4xx
dmaengine: ppc4xx: Use scnprintf() for avoiding potential buffer overflow
2020-03-11 15:10:45 +05:30
qcom
dmaengine: qcom: bam_dma: Drop local dma_parms
2020-09-11 17:42:13 +05:30
sf-pdma
dmaengine: sf-pdma: remove unused 'desc'
2020-09-18 12:30:53 +05:30
sh
dmaengine: Kconfig: Update description for RCAR_DMAC config
2020-09-11 17:48:28 +05:30
ti
dmaengine: ti: k3-udma-glue: fix channel enable functions
2020-09-18 13:06:26 +05:30
xilinx
dmaengine: xilinx: Simplify with dev_err_probe()
2020-09-03 12:38:59 +05:30
acpi-dma.c
dmaengine: acpi: Put the CSRT table after using it
2020-08-17 10:21:37 +05:30
altera-msgdma.c
dmaengine: altera-msgdma: Fix struct documentation blocks
2020-07-15 17:50:46 +05:30
amba-pl08x.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
at_hdmac_regs.h
dmaengine: at_hdmac: Replace zero-length array with flexible-array
2020-05-13 20:25:16 +05:30
at_hdmac.c
dmaengine: at_hdmac: add missing kfree() call in at_dma_xlate()
2020-08-19 09:58:38 +05:30
at_xdmac.c
dmaengine: at_xdmac: Replace zero-length array with flexible-array
2020-05-13 20:25:41 +05:30
bcm2835-dma.c
dmaengine: bcm2835: Drop local dma_parms
2020-09-11 17:42:12 +05:30
bcm-sba-raid.c
dmaengine: bcm-sba-raid: Replace zero-length array with flexible-array member
2020-02-13 20:15:35 +05:30
coh901318_lli.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
coh901318.c
dmaengine: coh901318: Fix a double lock bug in dma_tc_handle()
2020-02-24 21:59:45 +05:30
coh901318.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
dma-axi-dmac.c
dmaengine: axi-dmac: Drop local dma_parms
2020-09-11 17:42:12 +05:30
dma-jz4780.c
drivers/dma/dma-jz4780: Fix race condition between probe and irq handler
2020-08-25 16:45:17 +05:30
dmaengine.c
dmaengine: Save few bytes and increase readability of dma_request_chan()
2020-09-03 12:22:35 +05:30
dmaengine.h
dmaengine: Create debug directories for DMA devices
2020-03-11 14:56:14 +05:30
dmatest.c
dmaengine: dmatest: Check list for emptiness before access its last entry
2020-09-22 20:18:41 +05:30
ep93xx_dma.c
dmaengine: ep93xx_dma: Provide some missing struct attribute documentation
2020-07-15 17:50:46 +05:30
fsl_raid.c
…
fsl_raid.h
…
fsl-edma-common.c
dmaengine: fsl-edma: fix wrong tcd endianness for big-endian cpu
2020-07-06 14:49:22 +05:30
fsl-edma-common.h
dmaengine: fsl-edma-common: correct DSIZE_32BYTE
2020-07-06 10:24:49 +05:30
fsl-edma.c
dmaengine: fsl-edma: Fix NULL pointer exception in fsl_edma_tx_handler
2020-06-24 13:05:01 +05:30
fsl-qdma.c
dmaengine: Extend NXP QDMA driver to check transmission errors
2020-07-17 11:50:03 +05:30
fsldma.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
fsldma.h
fsldma: fix very broken 32-bit ppc ioread64 functionality
2020-08-29 13:50:56 -07:00
hisi_dma.c
dmaengine: hisilicon: Use struct_size() in devm_kzalloc()
2020-06-24 11:26:23 +05:30
idma64.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
idma64.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
img-mdc-dma.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 422
2019-06-05 17:37:15 +02:00
imx-dma.c
Linux 5.9-rc4
2020-09-11 17:45:36 +05:30
imx-sdma.c
dmaengine: imx-sdma: Drop local dma_parms
2020-09-11 17:42:13 +05:30
iop-adma.c
dmaengine: iop-adma: Fix pointer cast warnings
2020-09-18 12:55:16 +05:30
iop-adma.h
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
k3dma.c
dmaengine: k3dma: Avoid null pointer traversal
2019-12-23 13:21:14 +05:30
Kconfig
Merge branch 'topic/xilinx' into fixes
2020-08-07 11:13:37 +05:30
lpc18xx-dmamux.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
Makefile
dmaengine: uniphier-xdmac: Add UniPhier external DMA controller driver
2020-03-02 14:54:34 +05:30
mcf-edma.c
dmaengine: mcf-edma: Fix NULL pointer exception in mcf_edma_tx_handler
2020-06-24 13:06:15 +05:30
mic_x100_dma.c
dmaengine updates for v5.3-rc1
2019-07-17 09:55:43 -07:00
mic_x100_dma.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 290
2019-06-05 17:36:38 +02:00
milbeaut-hdmac.c
dmaengine: Replace zero-length array with flexible-array
2020-06-15 23:08:30 -05:00
milbeaut-xdmac.c
dmaengine: Replace zero-length array with flexible-array
2020-06-15 23:08:30 -05:00
mmp_pdma.c
dmaengine: mmp_pdma: Demote obvious misuse of kerneldoc to standard comment blocks
2020-07-15 17:50:46 +05:30
mmp_tdma.c
dmaengine: mmp_tdma: share the IRQ line
2020-06-16 21:59:01 +05:30
moxart-dma.c
dmaengine: Replace zero-length array with flexible-array
2020-06-15 23:08:30 -05:00
mpc512x_dma.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 7
2019-05-21 11:28:40 +02:00
mv_xor_v2.c
dmaengine: mv_xor_v2: Supply some missing 'struct mv_xor_v2_device' attribute docs
2020-07-15 17:50:47 +05:30
mv_xor.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288
2019-06-05 17:36:37 +02:00
mv_xor.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 288
2019-06-05 17:36:37 +02:00
mxs-dma.c
dmaengine: mxs: Drop local dma_parms
2020-09-11 17:42:13 +05:30
nbpfaxi.c
treewide: Use fallthrough pseudo-keyword
2020-08-23 17:36:59 -05:00
of-dma.c
dmaengine: of-dma: Fix of_dma_router_xlate's of_dma_xlate handling
2020-08-17 11:14:28 +05:30
owl-dma.c
dmaengine: Actions: Add support for S700 DMA engine
2020-07-27 14:43:08 +05:30
pch_dma.c
dmaengine: pch_dma: use generic power management
2020-08-17 10:23:55 +05:30
pl330.c
Linux 5.9-rc4
2020-09-11 17:45:36 +05:30
plx_dma.c
dmaengine: plx-dma: Implement descriptor submission
2020-01-15 19:40:51 +05:30
pxa_dma.c
dmaengine updates for v5.3-rc1
2019-07-17 09:55:43 -07:00
s3c24xx-dma.c
dmaengine: s3c24xx-dma: fix spelling mistake "to" -> "too"
2020-01-23 17:03:25 +05:30
sa11x0-dma.c
dmaengine: sa11x0: Replace zero-length array with flexible-array member
2020-02-19 17:48:40 +05:30
sirf-dma.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 4
2019-05-21 11:28:40 +02:00
sprd-dma.c
dmaengine: sprd: Set request pending flag when DMA controller is active
2020-03-23 11:38:24 +05:30
st_fdma.c
iov_iter: Move unnecessary inclusion of crypto/hash.h
2020-06-30 09:34:23 -04:00
st_fdma.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152
2019-05-30 11:26:32 -07:00
ste_dma40_ll.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
ste_dma40_ll.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 194
2019-05-30 11:29:22 -07:00
ste_dma40.c
dmaengine: ste_dma40: Drop local dma_parms
2020-09-11 17:42:13 +05:30
stm32-dma.c
dmaengine: stm32: Simplify with dev_err_probe()
2020-09-03 12:38:59 +05:30
stm32-dmamux.c
dmaengine: stm32: Simplify with dev_err_probe()
2020-09-03 12:38:59 +05:30
stm32-mdma.c
dmaengine: stm32: Simplify with dev_err_probe()
2020-09-03 12:38:59 +05:30
sun4i-dma.c
dmaengine: sun4i-dma: Demote obvious misuse of kerneldoc to standard comment blocks
2020-07-15 17:50:47 +05:30
sun6i-dma.c
dmaengine: Remove dev_err() usage after platform_get_irq()
2019-07-31 20:50:53 +05:30
tegra20-apb-dma.c
dmaengine: tegra-apb: Replace zero-length array with flexible-array
2020-06-15 23:08:32 -05:00
tegra210-adma.c
dmaengine: tegra210-adma: Fix runtime PM imbalance on error
2020-06-24 15:11:39 +05:30
timb_dma.c
dmaengine: Replace zero-length array with flexible-array
2020-06-15 23:08:30 -05:00
TODO
…
txx9dmac.c
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
txx9dmac.h
treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500
2019-06-19 17:09:55 +02:00
uniphier-mdmac.c
dmaengine: uniphier-mdmac: replace zero-length array with flexible-array member
2020-02-13 20:15:57 +05:30
uniphier-xdmac.c
iov_iter: Move unnecessary inclusion of crypto/hash.h
2020-06-30 09:34:23 -04:00
virt-dma.c
dmaengine updates for v5.6-rc1
2020-01-27 10:55:50 -08:00
virt-dma.h
dmaengine: virt-dma: Add missing locking around list operations
2019-12-26 10:04:18 +05:30
xgene-dma.c
dmaengine: xgene-dma: Provide descriptions for 'dev' and 'clk' in device's ddata
2020-07-15 17:50:47 +05:30
zx_dma.c
dmaengine: zx: remove redundant irqsave in hardIRQ
2020-09-18 12:30:50 +05:30