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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-04 13:24:27 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-03-04 13:24:27 -0800 |
| commit | 4f9020ffde71ddb92bc2f65ce0b00232bc88c590 (patch) | |
| tree | e67b1f3499f255477cadf5f418319fffed117874 /fs | |
| parent | 736706bee3298208343a76096370e4f6a5c55915 (diff) | |
| parent | d3d6a18d7d351cbcc9b33dbedf710e65f8ce1595 (diff) | |
| download | lwn-4f9020ffde71ddb92bc2f65ce0b00232bc88c590.tar.gz lwn-4f9020ffde71ddb92bc2f65ce0b00232bc88c590.zip | |
Merge branch 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
Pull vfs fixes from Al Viro:
"Assorted fixes that sat in -next for a while, all over the place"
* 'fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs:
aio: Fix locking in aio_poll()
exec: Fix mem leak in kernel_read_file
copy_mount_string: Limit string length to PATH_MAX
cgroup: saner refcounting for cgroup_root
fix cgroup_do_mount() handling of failure exits
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/aio.c | 12 | ||||
| -rw-r--r-- | fs/exec.c | 2 | ||||
| -rw-r--r-- | fs/kernfs/mount.c | 8 | ||||
| -rw-r--r-- | fs/namespace.c | 2 |
4 files changed, 17 insertions, 7 deletions
@@ -1666,6 +1666,7 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, struct poll_iocb *req = container_of(wait, struct poll_iocb, wait); struct aio_kiocb *iocb = container_of(req, struct aio_kiocb, poll); __poll_t mask = key_to_poll(key); + unsigned long flags; req->woken = true; @@ -1674,10 +1675,15 @@ static int aio_poll_wake(struct wait_queue_entry *wait, unsigned mode, int sync, if (!(mask & req->events)) return 0; - /* try to complete the iocb inline if we can: */ - if (spin_trylock(&iocb->ki_ctx->ctx_lock)) { + /* + * Try to complete the iocb inline if we can. Use + * irqsave/irqrestore because not all filesystems (e.g. fuse) + * call this function with IRQs disabled and because IRQs + * have to be disabled before ctx_lock is obtained. + */ + if (spin_trylock_irqsave(&iocb->ki_ctx->ctx_lock, flags)) { list_del(&iocb->ki_list); - spin_unlock(&iocb->ki_ctx->ctx_lock); + spin_unlock_irqrestore(&iocb->ki_ctx->ctx_lock, flags); list_del_init(&req->wait.entry); aio_poll_complete(iocb, mask); diff --git a/fs/exec.c b/fs/exec.c index fb72d36f7823..bcf383730bea 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -932,7 +932,7 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size, bytes = kernel_read(file, *buf + pos, i_size - pos, &pos); if (bytes < 0) { ret = bytes; - goto out; + goto out_free; } if (bytes == 0) diff --git a/fs/kernfs/mount.c b/fs/kernfs/mount.c index fdf527b6d79c..d71c9405874a 100644 --- a/fs/kernfs/mount.c +++ b/fs/kernfs/mount.c @@ -196,8 +196,10 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn, return dentry; knparent = find_next_ancestor(kn, NULL); - if (WARN_ON(!knparent)) + if (WARN_ON(!knparent)) { + dput(dentry); return ERR_PTR(-EINVAL); + } do { struct dentry *dtmp; @@ -206,8 +208,10 @@ struct dentry *kernfs_node_dentry(struct kernfs_node *kn, if (kn == knparent) return dentry; kntmp = find_next_ancestor(kn, knparent); - if (WARN_ON(!kntmp)) + if (WARN_ON(!kntmp)) { + dput(dentry); return ERR_PTR(-EINVAL); + } dtmp = lookup_one_len_unlocked(kntmp->name, dentry, strlen(kntmp->name)); dput(dentry); diff --git a/fs/namespace.c b/fs/namespace.c index 678ef175d63a..c4e83d94840c 100644 --- a/fs/namespace.c +++ b/fs/namespace.c @@ -2744,7 +2744,7 @@ void *copy_mount_options(const void __user * data) char *copy_mount_string(const void __user *data) { - return data ? strndup_user(data, PAGE_SIZE) : NULL; + return data ? strndup_user(data, PATH_MAX) : NULL; } /* |