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ipc/mqueue.c: fix mq_open() return value

commit d40dcdb0172a1ba853464983a059fb45e0aaf61a upstream.

We return ENOMEM from mqueue_get_inode even when we have enough memory.
Namely in case the system rlimit of mqueue was reached.  This error
propagates to mq_queue and user sees the error unexpectedly.  So fix
this up to properly return EMFILE as described in the manpage:

	EMFILE The process already has the maximum number of files and
	       message queues open.

instead of:

	ENOMEM Insufficient memory.

With the previous patch we just switch to ERR_PTR/PTR_ERR/IS_ERR error
handling here.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
  • Loading branch information...
commit 0d39ea76fa3b9a97e9dc45282613bc239ffa8509 1 parent 7688ef3
Jiri Slaby authored gregkh committed
Showing with 7 additions and 5 deletions.
  1. +7 −5 ipc/mqueue.c
View
12 ipc/mqueue.c
@@ -113,6 +113,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
{
struct user_struct *u = current_user();
struct inode *inode;
+ int ret = -ENOMEM;
inode = new_inode(sb);
if (!inode)
@@ -160,6 +161,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
u->mq_bytes + mq_bytes > task_rlimit(p, RLIMIT_MSGQUEUE)) {
spin_unlock(&mq_lock);
/* mqueue_evict_inode() releases info->messages */
+ ret = -EMFILE;
goto out_inode;
}
u->mq_bytes += mq_bytes;
@@ -179,7 +181,7 @@ static struct inode *mqueue_get_inode(struct super_block *sb,
out_inode:
iput(inode);
err:
- return NULL;
+ return ERR_PTR(ret);
}
static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
@@ -195,8 +197,8 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
inode = mqueue_get_inode(sb, ns, S_IFDIR | S_ISVTX | S_IRWXUGO,
NULL);
- if (!inode) {
- error = -ENOMEM;
+ if (IS_ERR(inode)) {
+ error = PTR_ERR(inode);
goto out;
}
@@ -316,8 +318,8 @@ static int mqueue_create(struct inode *dir, struct dentry *dentry,
spin_unlock(&mq_lock);
inode = mqueue_get_inode(dir->i_sb, ipc_ns, mode, attr);
- if (!inode) {
- error = -ENOMEM;
+ if (IS_ERR(inode)) {
+ error = PTR_ERR(inode);
spin_lock(&mq_lock);
ipc_ns->mq_queues_count--;
goto out_unlock;
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