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| author | Mao Jinlong <jinlmao@codeaurora.org> | 2020-11-27 10:52:53 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-11-27 20:23:13 +0100 |
| commit | 1cc573d5754e92372a7e30e35468644f8811e1a4 (patch) | |
| tree | 862c91c937e7472638be2b1003d0e8fdf2e46f33 /drivers/hwtracing | |
| parent | 92815c0041ffd16799b408ff9fce9bae697e2bf8 (diff) | |
| download | linux-1cc573d5754e92372a7e30e35468644f8811e1a4.tar.gz | |
coresight: tmc-etr: Check if page is valid before dma_map_page()
alloc_pages_node() return should be checked before calling
dma_map_page() to make sure that valid page is mapped or
else it can lead to aborts as below:
Unable to handle kernel paging request at virtual address ffffffc008000000
Mem abort info:
<snip>...
pc : __dma_inv_area+0x40/0x58
lr : dma_direct_map_page+0xd8/0x1c8
Call trace:
__dma_inv_area
tmc_pages_alloc
tmc_alloc_data_pages
tmc_alloc_sg_table
tmc_init_etr_sg_table
tmc_alloc_etr_buf
tmc_enable_etr_sink_sysfs
tmc_enable_etr_sink
coresight_enable_path
coresight_enable
enable_source_store
dev_attr_store
sysfs_kf_write
Fixes: 99443ea19e8b ("coresight: Add generic TMC sg table framework")
Cc: stable@vger.kernel.org
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Mao Jinlong <jinlmao@codeaurora.org>
Signed-off-by: Sai Prakash Ranjan <saiprakash.ranjan@codeaurora.org>
Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Link: https://lore.kernel.org/r/20201127175256.1092685-13-mathieu.poirier@linaro.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hwtracing')
| -rw-r--r-- | drivers/hwtracing/coresight/coresight-tmc-etr.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c index 525f0ecc129c..a31a4d7ae25e 100644 --- a/drivers/hwtracing/coresight/coresight-tmc-etr.c +++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c @@ -217,6 +217,8 @@ static int tmc_pages_alloc(struct tmc_pages *tmc_pages, } else { page = alloc_pages_node(node, GFP_KERNEL | __GFP_ZERO, 0); + if (!page) + goto err; } paddr = dma_map_page(real_dev, page, 0, PAGE_SIZE, dir); if (dma_mapping_error(real_dev, paddr)) |