diff options
| author | Laura Abbott <labbott@redhat.com> | 2018-04-11 04:03:30 +0300 |
|---|---|---|
| committer | Daniel Vetter <daniel.vetter@ffwll.ch> | 2018-05-23 11:45:22 +0300 |
| commit | ca510ead96d78c5379db5d36ffbdf5382f36db6d (patch) | |
| tree | 97470aae150f28d536a2c7e29e6f82a72fbe570f /drivers/gpu/drm | |
| parent | 520ea9347505f5eb90a6162385cf821e80b6c233 (diff) | |
| download | linux-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')
| -rw-r--r-- | drivers/gpu/drm/i2c/tda998x_drv.c | 13 |
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)); |