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| author | Elena Reshetova <elena.reshetova@intel.com> | 2017-03-17 13:12:46 +0200 |
|---|---|---|
| committer | Marcel Holtmann <marcel@holtmann.org> | 2017-04-12 22:02:36 +0200 |
| commit | dab6b5daeeb3e70bfb2ed2d6d6f02dd387e3b338 (patch) | |
| tree | f53267726421189109c1e348965ac84e4281ac5c | |
| parent | 9232259913022c1ab96f7bf2b87598b89b942f1f (diff) | |
| download | linux-dab6b5daeeb3e70bfb2ed2d6d6f02dd387e3b338.tar.gz | |
Bluetooth: convert rfcomm_dlc.refcnt from atomic_t to refcount_t
refcount_t type and corresponding API should be used instead of atomic_t when the variable is used as a reference counter. This allows to avoid accidental refcounter overflows that might lead to use-after-free situations. Signed-off-by: Elena Reshetova <elena.reshetova@intel.com> Signed-off-by: Hans Liljestrand <ishkamiel@gmail.com> Signed-off-by: Kees Cook <keescook@chromium.org> Signed-off-by: David Windsor <dwindsor@gmail.com> Signed-off-by: Marcel Holtmann <marcel@holtmann.org>
| -rw-r--r-- | include/net/bluetooth/rfcomm.h | 8 | ||||
| -rw-r--r-- | net/bluetooth/rfcomm/core.c | 4 |
2 files changed, 7 insertions, 5 deletions
diff --git a/include/net/bluetooth/rfcomm.h b/include/net/bluetooth/rfcomm.h index 4190af53a46a..da4acefe39c8 100644 --- a/include/net/bluetooth/rfcomm.h +++ b/include/net/bluetooth/rfcomm.h @@ -21,6 +21,8 @@ SOFTWARE IS DISCLAIMED. */ +#include <linux/refcount.h> + #ifndef __RFCOMM_H #define __RFCOMM_H @@ -174,7 +176,7 @@ struct rfcomm_dlc { struct mutex lock; unsigned long state; unsigned long flags; - atomic_t refcnt; + refcount_t refcnt; u8 dlci; u8 addr; u8 priority; @@ -247,12 +249,12 @@ struct rfcomm_dlc *rfcomm_dlc_exists(bdaddr_t *src, bdaddr_t *dst, u8 channel); static inline void rfcomm_dlc_hold(struct rfcomm_dlc *d) { - atomic_inc(&d->refcnt); + refcount_inc(&d->refcnt); } static inline void rfcomm_dlc_put(struct rfcomm_dlc *d) { - if (atomic_dec_and_test(&d->refcnt)) + if (refcount_dec_and_test(&d->refcnt)) rfcomm_dlc_free(d); } diff --git a/net/bluetooth/rfcomm/core.c b/net/bluetooth/rfcomm/core.c index f7eb02f09b54..8ebca9033d60 100644 --- a/net/bluetooth/rfcomm/core.c +++ b/net/bluetooth/rfcomm/core.c @@ -311,7 +311,7 @@ struct rfcomm_dlc *rfcomm_dlc_alloc(gfp_t prio) skb_queue_head_init(&d->tx_queue); mutex_init(&d->lock); - atomic_set(&d->refcnt, 1); + refcount_set(&d->refcnt, 1); rfcomm_dlc_clear_state(d); @@ -342,7 +342,7 @@ static void rfcomm_dlc_unlink(struct rfcomm_dlc *d) { struct rfcomm_session *s = d->session; - BT_DBG("dlc %p refcnt %d session %p", d, atomic_read(&d->refcnt), s); + BT_DBG("dlc %p refcnt %d session %p", d, refcount_read(&d->refcnt), s); list_del(&d->list); d->session = NULL; |