[PATCH] regmap: debugfs: check count when read regmap file

From: Peng Fan
Date: Thu Mar 12 2020 - 21:58:07 EST


When executing the following command, we met kernel dump.
dmesg -c > /dev/null; cd /sys;
for i in `ls /sys/kernel/debug/regmap/* -d`; do
echo "Checking regmap in $i";
cat $i/registers;
done && grep -ri "0x02d0" *;

It is because the count value is too big, and kmalloc fails. So add an
upper bound check to allow max size `PAGE_SIZE << (MAX_ORDER - 1)`.

Signed-off-by: Peng Fan <peng.fan@xxxxxxx>
Link: https://lore.kernel.org/r/1584064687-12964-1-git-send-email-peng.fan@xxxxxxx
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
drivers/base/regmap/regmap-debugfs.c | 6 ++++++
1 file changed, 6 insertions(+)

diff --git a/drivers/base/regmap/regmap-debugfs.c b/drivers/base/regmap/regmap-debugfs.c
index e72843fe41df..089e5dc7144a 100644
--- a/drivers/base/regmap/regmap-debugfs.c
+++ b/drivers/base/regmap/regmap-debugfs.c
@@ -227,6 +227,9 @@ static ssize_t regmap_read_debugfs(struct regmap *map, unsigned int from,
if (*ppos < 0 || !count)
return -EINVAL;

+ if (count > (PAGE_SIZE << (MAX_ORDER - 1)))
+ count = PAGE_SIZE << (MAX_ORDER - 1);
+
buf = kmalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
@@ -371,6 +374,9 @@ static ssize_t regmap_reg_ranges_read_file(struct file *file,
if (*ppos < 0 || !count)
return -EINVAL;

+ if (count > (PAGE_SIZE << (MAX_ORDER - 1)))
+ count = PAGE_SIZE << (MAX_ORDER - 1);
+
buf = kmalloc(count, GFP_KERNEL);
if (!buf)
return -ENOMEM;
--
2.20.1