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[PULL,1/8] smbios: Fix buffer overrun when using path= option

Message ID 20250408185538.85538-2-philmd@linaro.org
State Accepted
Commit a7a05f5f6a4085afbede315e749b1c67e78c966b
Headers show
Series [PULL,1/8] smbios: Fix buffer overrun when using path= option | expand

Commit Message

Philippe Mathieu-Daudé April 8, 2025, 6:55 p.m. UTC 
From: Daan De Meyer <daan.j.demeyer@gmail.com>

We have to make sure the array of bytes read from the path= file
is null-terminated, otherwise we run into a buffer overrun later on.

Fixes: bb99f4772f54017490e3356ecbb3df25c5d4537f ("hw/smbios: support loading OEM strings values from a file")
Resolves: https://gitlab.com/qemu-project/qemu/-/issues/2879

Signed-off-by: Daan De Meyer <daan.j.demeyer@gmail.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Tested-by: Valentin David <valentin.david@canonical.com>
Message-ID: <20250323213622.2581013-1-daan.j.demeyer@gmail.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
---
 hw/smbios/smbios.c | 3 +++
 1 file changed, 3 insertions(+)
diff mbox series

Patch

diff --git a/hw/smbios/smbios.c b/hw/smbios/smbios.c
index 02a09eb9cd0..ad4cd6721e6 100644
--- a/hw/smbios/smbios.c
+++ b/hw/smbios/smbios.c
@@ -1285,6 +1285,9 @@  static int save_opt_one(void *opaque,
             g_byte_array_append(data, (guint8 *)buf, ret);
         }
 
+        buf[0] = '\0';
+        g_byte_array_append(data, (guint8 *)buf, 1);
+
         qemu_close(fd);
 
         *opt->dest = g_renew(char *, *opt->dest, (*opt->ndest) + 1);