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authorLaura Abbott <labbott@redhat.com>2018-04-11 04:03:30 +0300
committerDaniel Vetter <daniel.vetter@ffwll.ch>2018-05-23 11:45:22 +0300
commitca510ead96d78c5379db5d36ffbdf5382f36db6d (patch)
tree97470aae150f28d536a2c7e29e6f82a72fbe570f /drivers/gpu/drm/i2c
parent520ea9347505f5eb90a6162385cf821e80b6c233 (diff)
downloadlinux-ca510ead96d78c5379db5d36ffbdf5382f36db6d.tar.xz
drm/i2c: tda998x: Remove VLA usage
There's an ongoing effort to remove VLAs[1] from the kernel to eventually turn on -Wvla. The vla in reg_write_range is based on the length of data passed. The one use of a non-constant size for this range is bounded by the size buffer passed to hdmi_infoframe_pack which is a fixed size. Switch to this upper bound. [1] https://lkml.org/lkml/2018/3/7/621 Signed-off-by: Laura Abbott <labbott@redhat.com> Reviewed-by: Kees Cook <keescook@chromium.org> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20180411010330.17866-1-labbott@redhat.com
Diffstat (limited to 'drivers/gpu/drm/i2c')
-rw-r--r--drivers/gpu/drm/i2c/tda998x_drv.c13
1 files changed, 11 insertions, 2 deletions
diff --git a/drivers/gpu/drm/i2c/tda998x_drv.c b/drivers/gpu/drm/i2c/tda998x_drv.c
index 421c8a72369e..0068d714d1bd 100644
--- a/drivers/gpu/drm/i2c/tda998x_drv.c
+++ b/drivers/gpu/drm/i2c/tda998x_drv.c
@@ -466,13 +466,22 @@ out:
return ret;
}
+#define MAX_WRITE_RANGE_BUF 32
+
static void
reg_write_range(struct tda998x_priv *priv, u16 reg, u8 *p, int cnt)
{
struct i2c_client *client = priv->hdmi;
- u8 buf[cnt+1];
+ /* This is the maximum size of the buffer passed in */
+ u8 buf[MAX_WRITE_RANGE_BUF + 1];
int ret;
+ if (cnt > MAX_WRITE_RANGE_BUF) {
+ dev_err(&client->dev, "Fixed write buffer too small (%d)\n",
+ MAX_WRITE_RANGE_BUF);
+ return;
+ }
+
buf[0] = REG2ADDR(reg);
memcpy(&buf[1], p, cnt);
@@ -679,7 +688,7 @@ static void
tda998x_write_if(struct tda998x_priv *priv, u8 bit, u16 addr,
union hdmi_infoframe *frame)
{
- u8 buf[32];
+ u8 buf[MAX_WRITE_RANGE_BUF];
ssize_t len;
len = hdmi_infoframe_pack(frame, buf, sizeof(buf));