feh --filelist: Do not overwrite filelist file if it is an image

1 files changed, 13 insertions, 0 deletions

diff --git a/src/filelist.c b/src/filelist.c
index 6439b9d..94baa06 100644
--- a/src/filelist.c
+++ b/src/filelist.c
@@ -460,10 +460,23 @@ gib_list *feh_read_filelist(char *filename)
 	FILE *fp;
 	gib_list *list = NULL;
 	char s[1024], s1[1024];
+	Imlib_Image tmp_im;
+	struct stat st;
 
 	if (!filename)
 		return(NULL);
 
+	/*
+	 * feh_load_image will fail horribly if filename is not seekable
+	 */
+	if (!stat(filename, &st) && S_ISREG(st.st_mode) &&
+			feh_load_image_char(&tmp_im, filename)) {
+		weprintf("Filelist file %s is an image, refusing to use it.\n"
+			"Did you mix up -f and -F?", filename);
+		opt.filelistfile = NULL;
+		return NULL;
+	}
+
 	errno = 0;
 	if ((fp = fopen(filename, "r")) == NULL) {
 		/* return quietly, as it's okay to specify a filelist file that doesn't