From: Zeng Heng <zengheng4@xxxxxxxxxx>
[ 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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221110082056.2014898-1-zengheng4@xxxxxxxxxx
Signed-off-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/pinctrl/devicetree.c | 2 ++
1 file changed, 2 insertions(+)
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) {
--
2.35.1
