Currently, an empty imput file causes `mmap()` to fail, and you get an
error like "mkimage: Can't read file.img: Invalid argument", which is
extremely unintuitive and hard to diagnose if you don't know what to
look for. Add an explicit check for an empty file and provide a clear
error message instead.
We already bounds check the image size when listing and re-signing
existing images, so we only need this check here, when opening data
files going into a image.
Signed-off-by: Thomas Hebb <tommyh...@gmail.com>
---
tools/mkimage.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/tools/mkimage.c b/tools/mkimage.c
index 302bfcf971..fbe883ce36 100644
--- a/tools/mkimage.c
+++ b/tools/mkimage.c
@@ -732,6 +732,12 @@ copy_file (int ifd, const char *datafile, int pad)
exit (EXIT_FAILURE);
}
+ if (sbuf.st_size == 0) {
+ fprintf (stderr, "%s: Input file %s is empty, bailing out\n",
+ params.cmdname, datafile);
+ exit (EXIT_FAILURE);
+ }
+
ptr = mmap(0, sbuf.st_size, PROT_READ, MAP_SHARED, dfd, 0);
if (ptr == MAP_FAILED) {
fprintf (stderr, "%s: Can't read %s: %s\n",
--
2.32.0
