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Index: head/sys/geom/eli/g_eli_integrity.c
===================================================================
--- head/sys/geom/eli/g_eli_integrity.c
+++ head/sys/geom/eli/g_eli_integrity.c
@@ -463,8 +463,16 @@
authkey = (u_char *)p; p += G_ELI_AUTH_SECKEYLEN;
data_secsize = sc->sc_data_per_sector;
- if ((i % lsec) == 0)
+ if ((i % lsec) == 0) {
data_secsize = decr_secsize % data_secsize;
+ /*
+ * Last encrypted sector of each decrypted sector is
+ * only partially filled.
+ */
+ if (bp->bio_cmd == BIO_WRITE)
+ memset(data + sc->sc_alen + data_secsize, 0,
+ encr_secsize - sc->sc_alen - data_secsize);
+ }
if (bp->bio_cmd == BIO_READ) {
/* Remember read HMAC. */

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