From d40dcdb0172a1ba853464983a059fb45e0aaf61a Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Tue, 26 Jul 2011 16:08:47 -0700 Subject: [PATCH] ipc/mqueue.c: fix mq_open() return value 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 Cc: Manfred Spraul Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- ipc/mqueue.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/ipc/mqueue.c b/ipc/mqueue.c index d43c30f72f1d..ed049ea568f4 100644 --- a/ipc/mqueue.c +++ b/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; -- GitLab