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amixer: expand local storage for item name according to kernel code

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According to kernel code (snd_ctl_elem_init_enum_names() in
sound/core/control.c), the maximum length of item name is 63 characters
(+ 1 terminator = 64 bytes). But current amixer implementation
uses 40 bytes. This causes name truncation and fail to operation.

This commit fixes this bug by expanding the length of local variables.

Signed-off-by: Takashi Sakamoto <o-takashi@sakamocchi.jp>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Takashi Sakamoto 2015-04-09 01:30:56 +09:00 committed by Takashi Iwai
parent 1a19ec1538
commit f3abdeea00
1 changed files with 9 additions and 2 deletions
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11
amixer/amixer.c
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@ -812,7 +812,11 @@ static int show_selem(snd_mixer_t *handle, snd_mixer_selem_id_t *id, const char
if (snd_mixer_selem_is_enumerated(elem)) {
int i, items;
unsigned int idx;
char itemname[40];
/*
* See snd_ctl_elem_init_enum_names() in
* sound/core/control.c.
*/
char itemname[64];
items = snd_mixer_selem_get_enum_items(elem);
printf(" Items:");
for (i = 0; i < items; i++) {
@ -1255,7 +1259,9 @@ static int get_enum_item_index(snd_mixer_elem_t *elem, char **ptrp)
{
char *ptr = *ptrp;
int items, i, len;
char name[40];
/* See snd_ctl_elem_init_enum_names() in sound/core/control.c. */
char name[64];
items = snd_mixer_selem_get_enum_items(elem);
if (items <= 0)
@ -1264,6 +1270,7 @@ static int get_enum_item_index(snd_mixer_elem_t *elem, char **ptrp)
for (i = 0; i < items; i++) {
if (snd_mixer_selem_get_enum_item_name(elem, i, sizeof(name)-1, name) < 0)
continue;
len = strlen(name);
if (! strncmp(name, ptr, len)) {
if (! ptr[len] || ptr[len] == ',' || ptr[len] == '\n') {