[PATCH 4/7] smbios: string table always needs two terminating NUL bytes

[Heinrich Schuchardt]

The string section of the different SMBIOS structures is always terminated
by two NUL bytes even if there is no string at all. This is described in
section 6.1.3 "Text string" of the SMBIOS 3.7.0 specification.

Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt at canonical.com>
---
 lib/smbios.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/lib/smbios.c b/lib/smbios.c
index 7bd9805fec0..81908e89610 100644
--- a/lib/smbios.c
+++ b/lib/smbios.c
@@ -311,6 +311,9 @@ int smbios_update_version(const char *version)
  */
 static int smbios_string_table_len(const struct smbios_ctx *ctx)
 {
+	/* If the structure contains no string it is followed by to NUL bytes */
+	if (ctx->next_ptr == ctx->eos)
+		return 2;
 	/* Allow for the final \0 after all strings */
 	return (ctx->next_ptr + 1) - ctx->eos;
 }
-- 
2.43.0