If something went wrong with creating a debugfs file/symlink/directory,
that value could be passed down into debugfs again as a parent dentry.
To make caller code simpler, just error out if this happens, and don't
crash the kernel.
Reported-by: Alex Elder <el...@linaro.org>
Cc: Viresh Kumar <viresh.ku...@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
fs/debugfs/inode.c | 3 +++
1 file changed, 3 insertions(+)
--- a/fs/debugfs/inode.c
+++ b/fs/debugfs/inode.c
@@ -254,6 +254,9 @@ static struct dentry *start_creating(con
pr_debug("debugfs: creating file '%s'\n",name);
+ if (IS_ERR(parent))
+ return parent;
+
error = simple_pin_fs(&debug_fs_type, &debugfs_mount,
&debugfs_mount_count);
if (error)
--
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