Kernel/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2025-01-07 13:43:51 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

spi: tegra20-slink: fix UAF in tegra_slink_remove()

Browse Source 
[ Upstream commit 7e9984d183 ]

After calling spi_unregister_master(), the refcount of master will
be decrease to 0, and it will be freed in spi_controller_release(),
the device data also will be freed, so it will lead a UAF when using
'tspi'. To fix this, get the master before unregister and put it when
finish using it.

Fixes: 26c8634182 ("spi: tegra20-slink: Don't use resource-managed spi_register helper")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Link: https://lore.kernel.org/r/20220713094024.1508869-1-yangyingliang@huawei.com
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yang Yingliang 2022-07-13 17:40:23 +08:00 committed by Greg Kroah-Hartman
parent 445fb9c19c
commit 415b4ce613
1 changed files with 2 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/spi/spi-tegra20-slink.c
View File

@ -1130,7 +1130,7 @@ static int tegra_slink_probe(struct platform_device *pdev)
static int tegra_slink_remove(struct platform_device *pdev)
{
struct spi_master *master = platform_get_drvdata(pdev);
struct spi_master *master = spi_master_get(platform_get_drvdata(pdev));
struct tegra_slink_data *tspi = spi_master_get_devdata(master);
spi_unregister_master(master);
@ -1145,6 +1145,7 @@ static int tegra_slink_remove(struct platform_device *pdev)
if (tspi->rx_dma_chan)
tegra_slink_deinit_dma_param(tspi, true);
spi_master_put(master);
return 0;
}