sbat: Fix two NULL derefs found with "gcc -fanalyzer"

"gcc -fanalyzer" found two NULL pointer checks we're missing in sbat.c:

include/str.h: In function ‘get_sbat_field.part.0’:
sbat.c:20:14: error: dereference of NULL ‘offset’ [CWE-476] [-Werror=analyzer-null-dereference]
   20 |         if (!*offset)

and

include/str.h: In function ‘parse_sbat’:
sbat.c:140:27: error: dereference of NULL ‘current’ [CWE-476] [-Werror=analyzer-null-dereference]
  140 |         } while (entry && *current != '\0');

Both are simple, and this patch fixes them.

Signed-off-by: Peter Jones <pjones@redhat.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/sbat.c b/sbat.c
index 5bda597b..446bed1a 100644
--- a/sbat.c
+++ b/sbat.c
@@ -17,7 +17,7 @@ get_sbat_field(CHAR8 *current, CHAR8 *end, const CHAR8 **field, char delim)
 	offset = strchrnula(current, delim);
 	*field = current;
 
-	if (!*offset)
+	if (!offset || !*offset)
 		return NULL;
 
 	*offset = '\0';
@@ -137,7 +137,7 @@ parse_sbat(char *sbat_base, size_t sbat_size, size_t *sbats, struct sbat_entry *
 			n = nsize / sizeof(entry);
 		}
 		entries[i++] = entry;
-	} while (entry && *current != '\0');
+	} while (entry && current && *current != '\0');
 
 	*sbats = i;
 	*sbat = entries;