of_flat_dt_debugfs_export_fdt uses initial_boot_params without checking
if it is valid, and ends up dereferencing a NULL pointer if there is
no DT blob.
This patch adds a check that initial_boot_params is NULL, returning
-ENOENT if it is.
Signed-off-by: Phil Elwell <phil@xxxxxxxxxxxxxxx>
---
drivers/of/fdt.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c
index d1ffca8..f018e5b 100644
--- a/drivers/of/fdt.c
+++ b/drivers/of/fdt.c
@@ -1085,8 +1085,12 @@ static struct debugfs_blob_wrapper flat_dt_blob;
static int __init of_flat_dt_debugfs_export_fdt(void)
{
- struct dentry *d = debugfs_create_dir("device-tree", NULL);
+ struct dentry *d;
+ if (!initial_boot_params)
+ return -ENOENT;
+
+ d = debugfs_create_dir("device-tree", NULL);
if (!d)
return -ENOENT;
--
1.9.1
--
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