[PATCH v6 10/12] FIT: fit_open: canonicalize provided filename

[Marco Felsch <m.felsch@pengutronix.de>]

Resolve any possible filename links to prepare the FIT code to cache the
fit_open() calls.

Signed-off-by: Marco Felsch <m.felsch@pengutronix.de>
---
 common/image-fit.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/common/image-fit.c b/common/image-fit.c
index 0067f46e60bc954b418aef3398e2c10856b41c02..afd82637444a479c8cbb41c5d779da6a013c0386 100644
--- a/common/image-fit.c
+++ b/common/image-fit.c
@@ -972,12 +972,19 @@ struct fit_handle *fit_open_buf(const void *buf, size_t size, bool verbose,
  *
  * Return: A handle to a FIT image or a ERR_PTR
  */
-struct fit_handle *fit_open(const char *filename, bool verbose,
+struct fit_handle *fit_open(const char *_filename, bool verbose,
 			    enum bootm_verify verify, loff_t max_size)
 {
 	struct fit_handle *handle;
+	char *filename;
 	int ret;
 
+	filename = canonicalize_path(AT_FDCWD, _filename);
+	if (!filename) {
+		pr_err("Cannot open %s: %m\n", _filename);
+		return ERR_PTR(-errno);
+	}
+
 	handle = xzalloc(sizeof(struct fit_handle));
 
 	handle->verbose = verbose;
@@ -988,9 +995,12 @@ struct fit_handle *fit_open(const char *filename, bool verbose,
 	if (ret && ret != -EFBIG) {
 		pr_err("unable to read %s: %pe\n", filename, ERR_PTR(ret));
 		free(handle);
+		free(filename);
 		return ERR_PTR(ret);
 	}
 
+	free(filename);
+
 	handle->fit = handle->fit_alloc;
 
 	ret = fit_do_open(handle);

-- 
2.39.5