[SECURITY PATCH 053/117] loader/bsd: Check for NULL arg up-front

[Daniel Kiper]

From: Darren Kenny <darren.kenny@oracle.com>

The code in the next block suggests that it is possible for .set to be
true but .arg may still be NULL.

This code assumes that it is never NULL, yet later is testing if it is
NULL - that is inconsistent.

So we should check first if .arg is not NULL, and remove this check that
is being flagged by Coverity since it is no longer required.

Fixes: CID 292471

Signed-off-by: Darren Kenny <darren.kenny@oracle.com>
Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com>
---
 grub-core/loader/i386/bsd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/grub-core/loader/i386/bsd.c b/grub-core/loader/i386/bsd.c
index f5bf7f89e..d89ff0a7a 100644
--- a/grub-core/loader/i386/bsd.c
+++ b/grub-core/loader/i386/bsd.c
@@ -1605,7 +1605,7 @@ grub_cmd_openbsd (grub_extcmd_context_t ctxt, int argc, 
char *argv[])
   kernel_type = KERNEL_TYPE_OPENBSD;
   bootflags = grub_bsd_parse_flags (ctxt->state, openbsd_flags);
 
-  if (ctxt->state[OPENBSD_ROOT_ARG].set)
+  if (ctxt->state[OPENBSD_ROOT_ARG].set && ctxt->state[OPENBSD_ROOT_ARG].arg 
!= NULL)
     {
       const char *arg = ctxt->state[OPENBSD_ROOT_ARG].arg;
       unsigned type, unit, part;
@@ -1622,7 +1622,7 @@ grub_cmd_openbsd (grub_extcmd_context_t ctxt, int argc, 
char *argv[])
                           "unknown disk type name");
 
       unit = grub_strtoul (arg, &arg, 10);
-      if (! (arg && *arg >= 'a' && *arg <= 'z'))
+      if (! (*arg >= 'a' && *arg <= 'z'))
        return grub_error (GRUB_ERR_BAD_ARGUMENT,
                           "only device specifications of form "
                           "<type><number><lowercase letter> are supported");
-- 
2.11.0