| From | Ben Hutchings <> | Date | Mon, 18 Jan 2016 03:18:35 +0000 | Subject | [PATCH 3.2 05/70] rfkill: copy the name into the rfkill struct |
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3.2.76-rc1 review patch. If anyone has any objections, please let me know.
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From: Johannes Berg <johannes.berg@intel.com>
commit b7bb110008607a915298bf0f47d25886ecb94477 upstream.
Some users of rfkill, like NFC and cfg80211, use a dynamic name when allocating rfkill, in those cases dev_name(). Therefore, the pointer passed to rfkill_alloc() might not be valid forever, I specifically found the case that the rfkill name was quite obviously an invalid pointer (or at least garbage) when the wiphy had been renamed.
Fix this by making a copy of the rfkill name in rfkill_alloc().
Signed-off-by: Johannes Berg <johannes.berg@intel.com> Signed-off-by: Ben Hutchings <ben@decadent.org.uk> --- net/rfkill/core.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/net/rfkill/core.c +++ b/net/rfkill/core.c @@ -50,7 +50,6 @@ struct rfkill { spinlock_t lock; - const char *name; enum rfkill_type type; unsigned long state; @@ -74,6 +73,7 @@ struct rfkill { struct delayed_work poll_work; struct work_struct uevent_work; struct work_struct sync_work; + char name[]; }; #define to_rfkill(d) container_of(d, struct rfkill, dev) @@ -848,14 +848,14 @@ struct rfkill * __must_check rfkill_allo if (WARN_ON(type == RFKILL_TYPE_ALL || type >= NUM_RFKILL_TYPES)) return NULL; - rfkill = kzalloc(sizeof(*rfkill), GFP_KERNEL); + rfkill = kzalloc(sizeof(*rfkill) + strlen(name) + 1, GFP_KERNEL); if (!rfkill) return NULL; spin_lock_init(&rfkill->lock); INIT_LIST_HEAD(&rfkill->node); rfkill->type = type; - rfkill->name = name; + strcpy(rfkill->name, name); rfkill->ops = ops; rfkill->data = ops_data;
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