Gitweb:
http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=283bb7fada7e33a759d8fc9bd7a44532e4ad420e
Commit: 283bb7fada7e33a759d8fc9bd7a44532e4ad420e
Parent: 3ac88a41ff747b8c2f290f86b5243b2f8fce2cc0
Author: Pierre Peiffer <[EMAIL PROTECTED]>
AuthorDate: Thu Oct 18 23:40:57 2007 -0700
Committer: Linus Torvalds <[EMAIL PROTECTED]>
CommitDate: Fri Oct 19 11:53:49 2007 -0700
IPC: fix error case when idr-cache is empty in ipcget()
With the use of idr to store the ipc, the case where the idr cache is
empty, when idr_get_new is called (this may happen even if we call
idr_pre_get() before), is not well handled: it lets
semget()/shmget()/msgget() return ENOSPC when this cache is empty, what 1.
does not reflect the facts and 2. does not conform to the man(s).
This patch fixes this by retrying the whole process of allocation in this
case.
Signed-off-by: Pierre Peiffer <[EMAIL PROTECTED]>
Cc: Nadia Derbey <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>
---
ipc/msg.c | 4 ++--
ipc/sem.c | 4 ++--
ipc/shm.c | 5 +++--
ipc/util.c | 16 +++++++++++-----
4 files changed, 18 insertions(+), 11 deletions(-)
diff --git a/ipc/msg.c b/ipc/msg.c
index ccf5f49..fdf3db5 100644
--- a/ipc/msg.c
+++ b/ipc/msg.c
@@ -203,10 +203,10 @@ static int newque(struct ipc_namespace *ns, struct
ipc_params *params)
* ipc_addid() locks msq
*/
id = ipc_addid(&msg_ids(ns), &msq->q_perm, ns->msg_ctlmni);
- if (id == -1) {
+ if (id < 0) {
security_msg_queue_free(msq);
ipc_rcu_putref(msq);
- return -ENOSPC;
+ return id;
}
msq->q_perm.id = msg_buildid(id, msq->q_perm.seq);
diff --git a/ipc/sem.c b/ipc/sem.c
index 7617f4f..35952c0 100644
--- a/ipc/sem.c
+++ b/ipc/sem.c
@@ -283,10 +283,10 @@ static int newary(struct ipc_namespace *ns, struct
ipc_params *params)
}
id = ipc_addid(&sem_ids(ns), &sma->sem_perm, ns->sc_semmni);
- if(id == -1) {
+ if (id < 0) {
security_sem_free(sma);
ipc_rcu_putref(sma);
- return -ENOSPC;
+ return id;
}
ns->used_sems += nsems;
diff --git a/ipc/shm.c b/ipc/shm.c
index 05c97c7..3818fae 100644
--- a/ipc/shm.c
+++ b/ipc/shm.c
@@ -433,10 +433,11 @@ static int newseg(struct ipc_namespace *ns, struct
ipc_params *params)
if (IS_ERR(file))
goto no_file;
- error = -ENOSPC;
id = shm_addid(ns, shp);
- if(id == -1)
+ if (id < 0) {
+ error = id;
goto no_id;
+ }
shp->shm_cprid = task_tgid_vnr(current);
shp->shm_lprid = 0;
diff --git a/ipc/util.c b/ipc/util.c
index b42fbd5..1aa0ebf 100644
--- a/ipc/util.c
+++ b/ipc/util.c
@@ -262,7 +262,7 @@ int ipc_get_maxid(struct ipc_ids *ids)
* Add an entry 'new' to the IPC ids idr. The permissions object is
* initialised and the first free entry is set up and the id assigned
* is returned. The 'new' entry is returned in a locked state on success.
- * On failure the entry is not locked and -1 is returned.
+ * On failure the entry is not locked and a negative err-code is returned.
*
* Called with ipc_ids.rw_mutex held as a writer.
*/
@@ -275,11 +275,11 @@ int ipc_addid(struct ipc_ids* ids, struct kern_ipc_perm*
new, int size)
size = IPCMNI;
if (ids->in_use >= size)
- return -1;
+ return -ENOSPC;
err = idr_get_new(&ids->ipcs_idr, new, &id);
if (err)
- return -1;
+ return err;
ids->in_use++;
@@ -311,7 +311,7 @@ int ipcget_new(struct ipc_namespace *ns, struct ipc_ids
*ids,
struct ipc_ops *ops, struct ipc_params *params)
{
int err;
-
+retry:
err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL);
if (!err)
@@ -321,6 +321,9 @@ int ipcget_new(struct ipc_namespace *ns, struct ipc_ids
*ids,
err = ops->getnew(ns, params);
up_write(&ids->rw_mutex);
+ if (err == -EAGAIN)
+ goto retry;
+
return err;
}
@@ -374,7 +377,7 @@ int ipcget_public(struct ipc_namespace *ns, struct ipc_ids
*ids,
struct kern_ipc_perm *ipcp;
int flg = params->flg;
int err;
-
+retry:
err = idr_pre_get(&ids->ipcs_idr, GFP_KERNEL);
/*
@@ -411,6 +414,9 @@ int ipcget_public(struct ipc_namespace *ns, struct ipc_ids
*ids,
}
up_write(&ids->rw_mutex);
+ if (err == -EAGAIN)
+ goto retry;
+
return err;
}
-
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