[PATCH v2 3/9] backends/tpm: Replace g_alloca() by g_malloc()

[Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>]

The ALLOCA(3) man-page mentions its "use is discouraged".

Replace a g_alloca() call by a g_malloc() one, moving the
allocation before the MUTEX guarded block.

Signed-off-by: Philippe Mathieu-Daudé <philmd@xxxxxxxxxx>
---
 backends/tpm/tpm_emulator.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/backends/tpm/tpm_emulator.c b/backends/tpm/tpm_emulator.c
index e5f1063ab6c..d37a6d563a3 100644
--- a/backends/tpm/tpm_emulator.c
+++ b/backends/tpm/tpm_emulator.c
@@ -124,10 +124,9 @@ static int tpm_emulator_ctrlcmd(TPMEmulator *tpm, unsigned long cmd, void *msg,
     CharBackend *dev = &tpm->ctrl_chr;
     uint32_t cmd_no = cpu_to_be32(cmd);
     ssize_t n = sizeof(uint32_t) + msg_len_in;
-    uint8_t *buf = NULL;
+    g_autofree uint8_t *buf = g_malloc(n);
 
     WITH_QEMU_LOCK_GUARD(&tpm->mutex) {
-        buf = g_alloca(n);
         memcpy(buf, &cmd_no, sizeof(cmd_no));
         memcpy(buf + sizeof(cmd_no), msg, msg_len_in);
 
-- 
2.26.3