diff options
author | Gustavo A. R. Silva <gustavoars@kernel.org> | 2020-07-22 21:15:34 +0300 |
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committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-23 10:27:09 +0300 |
commit | c56967d674e361ebe716e66992e3c5332b25ac1f (patch) | |
tree | 17022f48fd2f057224aef96402f83645ddd5e438 /drivers/misc/mei/hdcp/mei_hdcp.c | |
parent | cb0cec23cec009dd4a7c9a9f1ba9177b6047324e (diff) | |
download | linux-c56967d674e361ebe716e66992e3c5332b25ac1f.tar.xz |
mei: hdcp: Replace one-element array with flexible-array member
There is a regular need in the kernel to provide a way to declare
having a dynamically sized set of trailing elements in a structure.
Kernel code should always use “flexible array members”[1] for these
cases. The older style of one-element or zero-length arrays should
no longer be used[2].
Also, make use of the array_size() helper instead of the open-coded
version in memcpy(). These sorts of multiplication factors need to
be wrapped in array_size().
And while there, use the preferred form for passing a size of a struct.
The alternative form where struct name is spelled out hurts readability
and introduces an opportunity for a bug when the pointer variable type is
changed but the corresponding sizeof that is passed as argument is not.
[1] https://en.wikipedia.org/wiki/Flexible_array_member
[2] https://github.com/KSPP/linux/issues/79
Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Link: https://lore.kernel.org/r/20200722181534.GA31357@embeddedor
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/misc/mei/hdcp/mei_hdcp.c')
-rw-r--r-- | drivers/misc/mei/hdcp/mei_hdcp.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/misc/mei/hdcp/mei_hdcp.c b/drivers/misc/mei/hdcp/mei_hdcp.c index e6c3dc595617..d1d3e025ca0e 100644 --- a/drivers/misc/mei/hdcp/mei_hdcp.c +++ b/drivers/misc/mei/hdcp/mei_hdcp.c @@ -572,7 +572,7 @@ static int mei_hdcp_verify_mprime(struct device *dev, HDCP_2_2_MPRIME_LEN); drm_hdcp_cpu_to_be24(verify_mprime_in.seq_num_m, data->seq_num_m); memcpy(verify_mprime_in.streams, data->streams, - (data->k * sizeof(struct hdcp2_streamid_type))); + array_size(data->k, sizeof(*data->streams))); verify_mprime_in.k = cpu_to_be16(data->k); |