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Date: Wed, 29 Jul 2020 17:18:29 -0500 From: "Gustavo A. R. Silva" <gustavoars@...nel.org> To: Jaroslav Kysela <perex@...ex.cz>, Takashi Iwai <tiwai@...e.com> Cc: alsa-devel@...a-project.org, linux-kernel@...r.kernel.org, "Gustavo A. R. Silva" <gustavoars@...nel.org> Subject: [PATCH][next] ALSA: vmaster: Use flex_array_size() helper in memcpy() Make use of the flex_array_size() helper to calculate the size of a flexible array member within an enclosing structure. This helper offers defense-in-depth against potential integer overflows and makes it explicitly clear that we are dealing with a flexible array member. Signed-off-by: Gustavo A. R. Silva <gustavoars@...nel.org> --- sound/core/vmaster.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/sound/core/vmaster.c b/sound/core/vmaster.c index ab36f9898711..21ce4082cb5f 100644 --- a/sound/core/vmaster.c +++ b/sound/core/vmaster.c @@ -262,7 +262,8 @@ int _snd_ctl_add_follower(struct snd_kcontrol *master, return -ENOMEM; srec->kctl = follower; srec->follower = *follower; - memcpy(srec->follower.vd, follower->vd, follower->count * sizeof(*follower->vd)); + memcpy(srec->follower.vd, follower->vd, flex_array_size(srec, follower.vd, + srec->follower.count)); srec->master = master_link; srec->flags = flags; -- 2.27.0
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