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| author | Beau Belgrave <beaub@linux.microsoft.com> | 2023-12-10 21:35:34 +0000 |
|---|---|---|
| committer | Steven Rostedt (Google) <rostedt@goodmis.org> | 2023-12-12 19:00:37 -0500 |
| commit | 5eaf7f0589c0d88178f0fbeebe0e0b7108258707 (patch) | |
| tree | ddfe90eaf9354cbca70612c11b407e00553037de /fs/tracefs | |
| parent | b55b0a0d7c4aa2dac3579aa7e6802d1f57445096 (diff) | |
| download | linux-5eaf7f0589c0d88178f0fbeebe0e0b7108258707.tar.gz linux-5eaf7f0589c0d88178f0fbeebe0e0b7108258707.tar.bz2 linux-5eaf7f0589c0d88178f0fbeebe0e0b7108258707.zip | |
eventfs: Fix events beyond NAME_MAX blocking tasks
Eventfs uses simple_lookup(), however, it will fail if the name of the
entry is beyond NAME_MAX length. When this error is encountered, eventfs
still tries to create dentries instead of skipping the dentry creation.
When the dentry is attempted to be created in this state d_wait_lookup()
will loop forever, waiting for the lookup to be removed.
Fix eventfs to return the error in simple_lookup() back to the caller
instead of continuing to try to create the dentry.
Link: https://lore.kernel.org/linux-trace-kernel/20231210213534.497-1-beaub@linux.microsoft.com
Fixes: 63940449555e ("eventfs: Implement eventfs lookup, read, open functions")
Link: https://lore.kernel.org/linux-trace-kernel/20231208183601.GA46-beaub@linux.microsoft.com/
Signed-off-by: Beau Belgrave <beaub@linux.microsoft.com>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>
Diffstat (limited to 'fs/tracefs')
| -rw-r--r-- | fs/tracefs/event_inode.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/tracefs/event_inode.c b/fs/tracefs/event_inode.c index 0b90869fd805..43e237864a42 100644 --- a/fs/tracefs/event_inode.c +++ b/fs/tracefs/event_inode.c @@ -546,6 +546,8 @@ static struct dentry *eventfs_root_lookup(struct inode *dir, if (strcmp(ei_child->name, name) != 0) continue; ret = simple_lookup(dir, dentry, flags); + if (IS_ERR(ret)) + goto out; create_dir_dentry(ei, ei_child, ei_dentry, true); created = true; break; @@ -568,6 +570,8 @@ static struct dentry *eventfs_root_lookup(struct inode *dir, if (r <= 0) continue; ret = simple_lookup(dir, dentry, flags); + if (IS_ERR(ret)) + goto out; create_file_dentry(ei, i, ei_dentry, name, mode, cdata, fops, true); break; |