[PATCH v2 05/10] cryptodisk: Fix cipher IV mode 'plain64' always being set as 'plain'.

[Glenn Washburn]

When setting cipher IV mode, detection is done by prefix matching the
cipher IV mode part of the cipher mode string.  Since "plain" matches
"plain64", we must check for "plain64" first.  Otherwise, "plain64" will
be detected as "plain".

Signed-off-by: Glenn Washburn <development@efficientek.com>
Reviewed-by: Patrick Steinhardt <ps@pks.im>
---
 grub-core/disk/cryptodisk.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/disk/cryptodisk.c b/grub-core/disk/cryptodisk.c
index 13af84dd1..a3d672f68 100644
--- a/grub-core/disk/cryptodisk.c
+++ b/grub-core/disk/cryptodisk.c
@@ -501,10 +501,10 @@ grub_cryptodisk_setcipher (grub_cryptodisk_t crypt, const 
char *ciphername, cons
 
   if (cipheriv == NULL)
       ;
-  else if (grub_memcmp (cipheriv, "plain", sizeof ("plain") - 1) == 0)
-      mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN;
   else if (grub_memcmp (cipheriv, "plain64", sizeof ("plain64") - 1) == 0)
       mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN64;
+  else if (grub_memcmp (cipheriv, "plain", sizeof ("plain") - 1) == 0)
+      mode_iv = GRUB_CRYPTODISK_MODE_IV_PLAIN;
   else if (grub_memcmp (cipheriv, "benbi", sizeof ("benbi") - 1) == 0)
     {
       if (cipher->cipher->blocksize & (cipher->cipher->blocksize - 1)
-- 
2.27.0