Commit 0d9843799c for qemu.org

commit 0d9843799c7e2485458b419b6cd3159809dcc9fc
Author: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>
Date:   Tue Nov 10 12:04:28 2026 +0200

    virtio-snd: don't allocate pcm_info zero-count buf

    g_new0() might return NULL, which is UB if passed to a memcpy
    implementation that does not expect it (not in the usual case).

    Resolves: https://gitlab.com/qemu-project/qemu/-/work_items/3778
    Reviewed-by: Jim MacArthur <jim.macarthur@linaro.org>
    Signed-off-by: Manos Pitsidianakis <manos.pitsidianakis@linaro.org>

diff --git a/hw/audio/virtio-snd.c b/hw/audio/virtio-snd.c
index 89406f0a3a..a7d749f24f 100644
--- a/hw/audio/virtio-snd.c
+++ b/hw/audio/virtio-snd.c
@@ -267,6 +267,11 @@ static void virtio_snd_handle_pcm_info(VirtIOSound *s,
         return;
     }

+    if (count == 0) {
+        cmd->payload_size = 0;
+        cmd->resp.code = cpu_to_le32(VIRTIO_SND_S_OK);
+        return;
+    }
     pcm_info = g_new0(virtio_snd_pcm_info, count);
     for (uint32_t i = 0; i < count; i++) {
         stream_id = i + start_id;