With CONFIG_KASAN, this driver has shown a ridiculously large stack frame
in one configuration:
drivers/media/i2c/cx25840/cx25840-core.c:4960:1: error: the frame size of 94000 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
In most builds, it's only about 3300 bytes, but that's still large anough to
risk a kernel stack overflow.
Marking the two register access functions as noinline_for_kasan avoids
the problem and brings the largest stack frame size down to 232 bytes.
Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
drivers/media/i2c/cx25840/cx25840-core.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/i2c/cx25840/cx25840-core.c b/drivers/media/i2c/cx25840/cx25840-core.c
index b8d3c070bfc1..fd72e5a11cb9 100644
--- a/drivers/media/i2c/cx25840/cx25840-core.c
+++ b/drivers/media/i2c/cx25840/cx25840-core.c
@@ -81,7 +81,7 @@ MODULE_PARM_DESC(debug, "Debugging messages [0=Off (default) 1=On]");
/* ----------------------------------------------------------------------- */
static void cx23888_std_setup(struct i2c_client *client);
-int cx25840_write(struct i2c_client *client, u16 addr, u8 value)
+noinline_for_kasan int cx25840_write(struct i2c_client *client, u16 addr, u8 value)
{
u8 buffer[3];
buffer[0] = addr >> 8;
@@ -90,7 +90,7 @@ int cx25840_write(struct i2c_client *client, u16 addr, u8 value)
return i2c_master_send(client, buffer, 3);
}
-int cx25840_write4(struct i2c_client *client, u16 addr, u32 value)
+noinline_for_kasan int cx25840_write4(struct i2c_client *client, u16 addr, u32 value)
{
u8 buffer[6];
buffer[0] = addr >> 8;
--
2.9.0
