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 tommyhebb@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",