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Subject[PATCH 4/6] mqueue: only set error codes if they are really necessary
Date
... postponing assignments until they're needed. Doesn't change code size.

Signed-off-by: André Goddard Rosa <andre.goddard@gmail.com>
---
ipc/mqueue.c | 77 +++++++++++++++++++++++++++++++++++++--------------------
1 files changed, 50 insertions(+), 27 deletions(-)

diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 2cddf93..906e873 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -184,7 +184,7 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
{
struct inode *inode;
struct ipc_namespace *ns = data;
- int error = 0;
+ int error;

sb->s_blocksize = PAGE_CACHE_SIZE;
sb->s_blocksize_bits = PAGE_CACHE_SHIFT;
@@ -202,7 +202,9 @@ static int mqueue_fill_super(struct super_block *sb, void *data, int silent)
if (!sb->s_root) {
iput(inode);
error = -ENOMEM;
+ goto out;
}
+ error = 0;

out:
return error;
@@ -621,9 +623,10 @@ static struct file *do_create(struct ipc_namespace *ipc_ns, struct dentry *dir,
int ret;

if (attr) {
- ret = -EINVAL;
- if (!mq_attr_ok(ipc_ns, attr))
+ if (!mq_attr_ok(ipc_ns, attr)) {
+ ret = -EINVAL;
goto out;
+ }
/* store for use during create */
dentry->d_fsdata = attr;
}
@@ -714,9 +717,10 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode,
if (oflag & O_CREAT) {
if (dentry->d_inode) { /* entry already exists */
audit_inode(name, dentry);
- error = -EEXIST;
- if (oflag & O_EXCL)
+ if (oflag & O_EXCL) {
+ error = -EEXIST;
goto out;
+ }
filp = do_open(ipc_ns, dentry, oflag);
} else {
filp = do_create(ipc_ns, ipc_ns->mq_mnt->mnt_root,
@@ -724,9 +728,10 @@ SYSCALL_DEFINE4(mq_open, const char __user *, u_name, int, oflag, mode_t, mode,
u_attr ? &attr : NULL);
}
} else {
- error = -ENOENT;
- if (!dentry->d_inode)
+ if (!dentry->d_inode) {
+ error = -ENOENT;
goto out;
+ }
audit_inode(name, dentry);
filp = do_open(ipc_ns, dentry, oflag);
}
@@ -874,19 +879,24 @@ SYSCALL_DEFINE5(mq_timedsend, mqd_t, mqdes, const char __user *, u_msg_ptr,
audit_mq_sendrecv(mqdes, msg_len, msg_prio, p);
timeout = prepare_timeout(p);

- ret = -EBADF;
filp = fget(mqdes);
- if (unlikely(!filp))
+ if (unlikely(!filp)) {
+ ret = -EBADF;
goto out;
+ }

inode = filp->f_path.dentry->d_inode;
- if (unlikely(filp->f_op != &mqueue_file_operations))
+ if (unlikely(filp->f_op != &mqueue_file_operations)) {
+ ret = -EBADF;
goto out_fput;
+ }
info = MQUEUE_I(inode);
audit_inode(NULL, filp->f_path.dentry);

- if (unlikely(!(filp->f_mode & FMODE_WRITE)))
+ if (unlikely(!(filp->f_mode & FMODE_WRITE))) {
+ ret = -EBADF;
goto out_fput;
+ }

if (unlikely(msg_len > info->attr.mq_msgsize)) {
ret = -EMSGSIZE;
@@ -963,19 +973,24 @@ SYSCALL_DEFINE5(mq_timedreceive, mqd_t, mqdes, char __user *, u_msg_ptr,
audit_mq_sendrecv(mqdes, msg_len, 0, p);
timeout = prepare_timeout(p);

- ret = -EBADF;
filp = fget(mqdes);
- if (unlikely(!filp))
+ if (unlikely(!filp)) {
+ ret = -EBADF;
goto out;
+ }

inode = filp->f_path.dentry->d_inode;
- if (unlikely(filp->f_op != &mqueue_file_operations))
+ if (unlikely(filp->f_op != &mqueue_file_operations)) {
+ ret = -EBADF;
goto out_fput;
+ }
info = MQUEUE_I(inode);
audit_inode(NULL, filp->f_path.dentry);

- if (unlikely(!(filp->f_mode & FMODE_READ)))
+ if (unlikely(!(filp->f_mode & FMODE_READ))) {
+ ret = -EBADF;
goto out_fput;
+ }

/* checks if buffer is big enough */
if (unlikely(msg_len < info->attr.mq_msgsize)) {
@@ -1065,13 +1080,14 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes,

/* create the notify skb */
nc = alloc_skb(NOTIFY_COOKIE_LEN, GFP_KERNEL);
- ret = -ENOMEM;
- if (!nc)
+ if (!nc) {
+ ret = -ENOMEM;
goto out;
- ret = -EFAULT;
+ }
if (copy_from_user(nc->data,
notification.sigev_value.sival_ptr,
NOTIFY_COOKIE_LEN)) {
+ ret = -EFAULT;
goto out;
}

@@ -1080,9 +1096,10 @@ SYSCALL_DEFINE2(mq_notify, mqd_t, mqdes,
/* and attach it to the socket */
retry:
filp = fget(notification.sigev_signo);
- ret = -EBADF;
- if (!filp)
+ if (!filp) {
+ ret = -EBADF;
goto out;
+ }
sock = netlink_getsockbyfilp(filp);
fput(filp);
if (IS_ERR(sock)) {
@@ -1094,7 +1111,7 @@ retry:
timeo = MAX_SCHEDULE_TIMEOUT;
ret = netlink_attachskb(sock, nc, &timeo, NULL);
if (ret == 1)
- goto retry;
+ goto retry;
if (ret) {
sock = NULL;
nc = NULL;
@@ -1103,14 +1120,17 @@ retry:
}
}

- ret = -EBADF;
filp = fget(mqdes);
- if (!filp)
+ if (!filp) {
+ ret = -EBADF;
goto out;
+ }

inode = filp->f_path.dentry->d_inode;
- if (unlikely(filp->f_op != &mqueue_file_operations))
+ if (unlikely(filp->f_op != &mqueue_file_operations)) {
+ ret = -EBADF;
goto out_fput;
+ }
info = MQUEUE_I(inode);

ret = 0;
@@ -1173,14 +1193,17 @@ SYSCALL_DEFINE3(mq_getsetattr, mqd_t, mqdes,
return -EINVAL;
}

- ret = -EBADF;
filp = fget(mqdes);
- if (!filp)
+ if (!filp) {
+ ret = -EBADF;
goto out;
+ }

inode = filp->f_path.dentry->d_inode;
- if (unlikely(filp->f_op != &mqueue_file_operations))
+ if (unlikely(filp->f_op != &mqueue_file_operations)) {
+ ret = -EBADF;
goto out_fput;
+ }
info = MQUEUE_I(inode);

spin_lock(&info->lock);
--
1.7.0.87.g0901d
--
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