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author | Zeng Heng <zengheng4@huawei.com> | 2022-11-10 11:20:56 +0300 |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2022-11-25 19:45:44 +0300 |
commit | 777430aa4ddccaa5accec6db90ffc1d47f00d471 (patch) | |
tree | fc4142fbde221ea801ce1d6dc26b00320aac8d60 /drivers/pinctrl | |
parent | bce3e6fe8ba7cc42d0111281f135204ce16e0d94 (diff) | |
download | linux-777430aa4ddccaa5accec6db90ffc1d47f00d471.tar.xz |
pinctrl: devicetree: fix null pointer dereferencing in pinctrl_dt_to_map
[ Upstream commit 91d5c5060ee24fe8da88cd585bb43b843d2f0dce ]
Here is the BUG report by KASAN about null pointer dereference:
BUG: KASAN: null-ptr-deref in strcmp+0x2e/0x50
Read of size 1 at addr 0000000000000000 by task python3/2640
Call Trace:
strcmp
__of_find_property
of_find_property
pinctrl_dt_to_map
kasprintf() would return NULL pointer when kmalloc() fail to allocate.
So directly return ENOMEM, if kasprintf() return NULL pointer.
Fixes: 57291ce295c0 ("pinctrl: core device tree mapping table parsing support")
Signed-off-by: Zeng Heng <zengheng4@huawei.com>
Link: https://lore.kernel.org/r/20221110082056.2014898-1-zengheng4@huawei.com
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Diffstat (limited to 'drivers/pinctrl')
-rw-r--r-- | drivers/pinctrl/devicetree.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c index 3fb238714718..eac55fee5281 100644 --- a/drivers/pinctrl/devicetree.c +++ b/drivers/pinctrl/devicetree.c @@ -220,6 +220,8 @@ int pinctrl_dt_to_map(struct pinctrl *p, struct pinctrl_dev *pctldev) for (state = 0; ; state++) { /* Retrieve the pinctrl-* property */ propname = kasprintf(GFP_KERNEL, "pinctrl-%d", state); + if (!propname) + return -ENOMEM; prop = of_find_property(np, propname, &size); kfree(propname); if (!prop) { |