diff -up kbd-2.4.0/src/libkfont/psffontop.c.orig kbd-2.4.0/src/libkfont/psffontop.c
--- kbd-2.4.0/src/libkfont/psffontop.c.orig	2020-04-27 17:53:01.000000000 +0200
+++ kbd-2.4.0/src/libkfont/psffontop.c	2021-04-27 09:59:14.170153676 +0200
@@ -235,6 +235,7 @@ kfont_read_psffont(struct kfont_context
 
 		if (psfhdr->mode > PSF1_MAXMODE) {
 			KFONT_ERR(ctx, _("Unsupported psf file mode (%d)"), psfhdr->mode);
+			free(psfhdr);
 			return -EX_DATAERR;
 		}
 		fontlen   = ((psfhdr->mode & PSF1_MODE512) ? 512 : 256);
@@ -251,6 +252,7 @@ kfont_read_psffont(struct kfont_context
 
 		if (psfhdr.version > PSF2_MAXVERSION) {
 			KFONT_ERR(ctx, _("Unsupported psf version (%d)"), psfhdr.version);
+			free(inputbuf);
 			return -EX_DATAERR;
 		}
 		fontlen   = assemble_uint32((unsigned char *)&psfhdr.length);
@@ -260,16 +262,20 @@ kfont_read_psffont(struct kfont_context
 		ftoffset  = assemble_uint32((unsigned char *)&psfhdr.headersize);
 		fontwidth = assemble_uint32((unsigned char *)&psfhdr.width);
 		utf8      = 1;
-	} else
+	} else {
+		free(inputbuf);
 		return -EX_DATAERR; /* not psf */
+	}
 
 	/* tests required - we divide by these */
 	if (fontlen == 0) {
 		KFONT_ERR(ctx, _("zero input font length?"));
+		free(inputbuf);
 		return -EX_DATAERR;
 	}
 	if (charsize == 0) {
 		KFONT_ERR(ctx, _("zero input character size?"));
+		free(inputbuf);
 		return -EX_DATAERR;
 	}
 
@@ -277,6 +283,7 @@ kfont_read_psffont(struct kfont_context
 
 	if (i > inputlth || (!hastable && i != inputlth)) {
 		KFONT_ERR(ctx, _("Input file: bad input length (%d)"), inputlth);
+		free(inputbuf);
 		return -EX_DATAERR;
 	}