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net, rds: convert rds_mr.r_refcount from atomic_t to refcount_t

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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: David S. Miller <davem@davemloft.net>
This commit is contained in:
Reshetova, Elena 2017-07-04 15:53:17 +03:00 • committed by David S. Miller
parent b7f0292094
commit 803ea85053
2 changed files with 7 additions and 7 deletions
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10
net/rds/rdma.c
View file

@ -84,7 +84,7 @@ static struct rds_mr *rds_mr_tree_walk(struct rb_root *root, u64 key,
if (insert) { if (insert) {
rb_link_node(&insert->r_rb_node, parent, p); rb_link_node(&insert->r_rb_node, parent, p);
rb_insert_color(&insert->r_rb_node, root); rb_insert_color(&insert->r_rb_node, root);
atomic_inc(&insert->r_refcount); refcount_inc(&insert->r_refcount);
} }
return NULL; return NULL;
} }
@ -99,7 +99,7 @@ static void rds_destroy_mr(struct rds_mr *mr)
unsigned long flags; unsigned long flags;
rdsdebug("RDS: destroy mr key is %x refcnt %u\n", rdsdebug("RDS: destroy mr key is %x refcnt %u\n",
mr->r_key, atomic_read(&mr->r_refcount)); mr->r_key, refcount_read(&mr->r_refcount));
if (test_and_set_bit(RDS_MR_DEAD, &mr->r_state)) if (test_and_set_bit(RDS_MR_DEAD, &mr->r_state))
return; return;
@ -223,7 +223,7 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
goto out; goto out;
} }
atomic_set(&mr->r_refcount, 1); refcount_set(&mr->r_refcount, 1);
RB_CLEAR_NODE(&mr->r_rb_node); RB_CLEAR_NODE(&mr->r_rb_node);
mr->r_trans = rs->rs_transport; mr->r_trans = rs->rs_transport;
mr->r_sock = rs; mr->r_sock = rs;
@ -307,7 +307,7 @@ static int __rds_rdma_map(struct rds_sock *rs, struct rds_get_mr_args *args,
rdsdebug("RDS: get_mr key is %x\n", mr->r_key); rdsdebug("RDS: get_mr key is %x\n", mr->r_key);
if (mr_ret) { if (mr_ret) {
atomic_inc(&mr->r_refcount); refcount_inc(&mr->r_refcount);
*mr_ret = mr; *mr_ret = mr;
} }
@ -756,7 +756,7 @@ int rds_cmsg_rdma_dest(struct rds_sock *rs, struct rds_message *rm,
if (!mr) if (!mr)
err = -EINVAL; /* invalid r_key */ err = -EINVAL; /* invalid r_key */
else else
atomic_inc(&mr->r_refcount); refcount_inc(&mr->r_refcount);
spin_unlock_irqrestore(&rs->rs_rdma_lock, flags); spin_unlock_irqrestore(&rs->rs_rdma_lock, flags);
if (mr) { if (mr) {

4
net/rds/rds.h
View file

@ -277,7 +277,7 @@ struct rds_incoming {
struct rds_mr { struct rds_mr {
struct rb_node r_rb_node; struct rb_node r_rb_node;
atomic_t r_refcount; refcount_t r_refcount;
u32 r_key; u32 r_key;
/* A copy of the creation flags */ /* A copy of the creation flags */
@ -857,7 +857,7 @@ int rds_cmsg_atomic(struct rds_sock *rs, struct rds_message *rm,
void __rds_put_mr_final(struct rds_mr *mr); void __rds_put_mr_final(struct rds_mr *mr);
static inline void rds_mr_put(struct rds_mr *mr) static inline void rds_mr_put(struct rds_mr *mr)
{ {
if (atomic_dec_and_test(&mr->r_refcount)) if (refcount_dec_and_test(&mr->r_refcount))
__rds_put_mr_final(mr); __rds_put_mr_final(mr);
} }