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ALSA: control: Annotate snd_kcontrol with __counted_by()

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struct snd_kcontrol contains a flex array of snd_kcontrol_volatile
objects at its end, and the array size is stored in count field.
This can be annotated gracefully with __counted_by() for catching
possible array overflows.

One additional change is the order of the count field initialization;
The assignment of the count field is moved before assignment of vd[]
elements for avoiding false-positive warnings from compilers.

Link: https://patch.msgid.link/20240726152840.8629-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Iwai 2024-07-26 17:28:15 +02:00
parent 3c0e1ed9c8
commit 4e9652003b
2 changed files with 2 additions and 2 deletions
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2
include/sound/control.h
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@ -81,7 +81,7 @@ struct snd_kcontrol {
unsigned long private_value;
void *private_data;
void (*private_free)(struct snd_kcontrol *kcontrol);
struct snd_kcontrol_volatile vd[]; /* volatile data */
struct snd_kcontrol_volatile vd[] __counted_by(count); /* volatile data */
};
#define snd_kcontrol(n) list_entry(n, struct snd_kcontrol, list)

2
sound/core/control.c
View File

@ -237,11 +237,11 @@ static int snd_ctl_new(struct snd_kcontrol **kctl, unsigned int count,
if (!*kctl)
return -ENOMEM;
(*kctl)->count = count;
for (idx = 0; idx < count; idx++) {
(*kctl)->vd[idx].access = access;
(*kctl)->vd[idx].owner = file;
}
(*kctl)->count = count;
return 0;
}