Linux Kernel “sound/oss/opl3.c”本地权限提升漏洞

                                                ---
sound/oss/opl3.c |   15 +++++++++++++--
1 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/sound/oss/opl3.c b/sound/oss/opl3.c
index 938c48c..e9d443e 100644
--- a/sound/oss/opl3.c
+++ b/sound/oss/opl3.c
@@ -849,6 +849,10 @@ static int opl3_load_patch(int dev, int format, const char __user *addr,

static void opl3_panning(int dev, int voice, int value)
{
+
+    if (voice < 0 || voice >= devc->nr_voice)
+        return;
+
    devc->voc[voice].panning = value;
}

@@ -1066,8 +1070,15 @@ static int opl3_alloc_voice(int dev, int chn, int note, struct voice_alloc_info

static void opl3_setup_voice(int dev, int voice, int chn)
{
-    struct channel_info *info =
-    &synth_devs[dev]->chn_info[chn];
+    struct channel_info *info;
+
+    if (voice < 0 || voice >= devc->nr_voice)
+        return;
+
+    if (chn < 0 || chn > 15)
+        return;
+
+    info = &synth_devs[dev]->chn_info[chn];

    opl3_set_instr(dev, voice, info->pgm_num);

--