From: Zeng Heng zengheng4@huawei.com
[ 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 --- drivers/pinctrl/devicetree.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/pinctrl/devicetree.c b/drivers/pinctrl/devicetree.c index dbaacde1b36a..362d84c2ead4 100644 --- a/drivers/pinctrl/devicetree.c +++ b/drivers/pinctrl/devicetree.c @@ -223,6 +223,8 @@ 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) {