Sometimes a hook manipulates the config tree, which makes currently running iterators point to freed memory. As a workaround, make two copies, one for the iterators and another for the hooks.
BugLink: https://bugs.launchpad.net/bugs/1008600 Signed-off-by: David Henningsson david.henningsson@canonical.com --- src/control/namehint.c | 22 +++++++++++++--------- 1 file changed, 13 insertions(+), 9 deletions(-)
diff --git a/src/control/namehint.c b/src/control/namehint.c index 8d5e925..28975a4 100644 --- a/src/control/namehint.c +++ b/src/control/namehint.c @@ -406,7 +406,7 @@ static const next_devices_t next_devices[] = { }; #endif
-static int add_card(snd_config_t *config, struct hint_list *list, int card) +static int add_card(snd_config_t *config, snd_config_t *rw_config, struct hint_list *list, int card) { int err, ok; snd_config_t *conf, *n; @@ -449,7 +449,7 @@ static int add_card(snd_config_t *config, struct hint_list *list, int card) ok = 0; for (device = 0; err >= 0 && device <= max_device; device++) { list->device = device; - err = try_config(config, list, list->siface, str); + err = try_config(rw_config, list, list->siface, str); if (err < 0) break; ok++; @@ -464,7 +464,7 @@ static int add_card(snd_config_t *config, struct hint_list *list, int card) if (err < 0) { list->card = card; list->device = -1; - err = try_config(config, list, list->siface, str); + err = try_config(rw_config, list, list->siface, str); } if (err == -ENOMEM) goto __error; @@ -493,7 +493,8 @@ static int get_card_name(struct hint_list *list, int card) return 0; }
-static int add_software_devices(snd_config_t *config, struct hint_list *list) +static int add_software_devices(snd_config_t *config, snd_config_t *rw_config, + struct hint_list *list) { int err; snd_config_t *conf, *n; @@ -509,7 +510,7 @@ static int add_software_devices(snd_config_t *config, struct hint_list *list) continue; list->card = -1; list->device = -1; - err = try_config(config, list, list->siface, str); + err = try_config(rw_config, list, list->siface, str); if (err == -ENOMEM) return -ENOMEM; } @@ -547,7 +548,7 @@ int snd_device_name_hint(int card, const char *iface, void ***hints) struct hint_list list; char ehints[24]; const char *str; - snd_config_t *conf, *local_config = NULL; + snd_config_t *conf, *local_config = NULL, *local_config_rw = NULL; snd_config_update_t *local_config_update = NULL; snd_config_iterator_t i, next; int err; @@ -557,6 +558,7 @@ int snd_device_name_hint(int card, const char *iface, void ***hints) err = snd_config_update_r(&local_config, &local_config_update, NULL); if (err < 0) return err; + err = snd_config_copy(&local_config_rw, local_config); list.list = NULL; list.count = list.allocated = 0; list.siface = iface; @@ -586,9 +588,9 @@ int snd_device_name_hint(int card, const char *iface, void ***hints) if (card >= 0) { err = get_card_name(&list, card); if (err >= 0) - err = add_card(local_config, &list, card); + err = add_card(local_config, local_config_rw, &list, card); } else { - add_software_devices(local_config, &list); + add_software_devices(local_config, local_config_rw, &list); err = snd_card_next(&card); if (err < 0) goto __error; @@ -596,7 +598,7 @@ int snd_device_name_hint(int card, const char *iface, void ***hints) err = get_card_name(&list, card); if (err < 0) goto __error; - err = add_card(local_config, &list, card); + err = add_card(local_config, local_config_rw, &list, card); if (err < 0) goto __error; err = snd_card_next(&card); @@ -630,6 +632,8 @@ int snd_device_name_hint(int card, const char *iface, void ***hints) if (list.cardname) free(list.cardname); } + if (local_config_rw) + snd_config_delete(local_config_rw); if (local_config) snd_config_delete(local_config); if (local_config_update)