ALSA: pcm: oss: Fix regression by buffer overflow fix

The recent fix for the OOB access in PCM OSS plugins (commit
2a86cec927f1: "ALSA: pcm: oss: Avoid plugin buffer overflow") caused a
regression on OSS applications.  The patch introduced the size check
in client and slave size calculations to limit to each plugin's buffer
size, but I overlooked that some code paths call those without
allocating the buffer but just for estimation.

This patch fixes the bug by skipping the size check for those code
paths while keeping checking in the actual transfer calls.

Fixes: 2a86cec927f1 ("ALSA: pcm: oss: Avoid plugin buffer overflow")
Tested-and-reported-by: Jari Ruusu <jari.ruusu@gmail.com>
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20200403072515.25539-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/core/oss/pcm_plugin.c b/sound/core/oss/pcm_plugin.c
index 752d078908e9d017ad633da45c052e22c6ba9b25..50c35ecc8953fb329cead15b535578a297ffd91f 100644 (file)
--- a/sound/core/oss/pcm_plugin.c
+++ b/sound/core/oss/pcm_plugin.c
@@ -196,7 +196,9 @@ int snd_pcm_plugin_free(struct snd_pcm_plugin *plugin)
        return 0;
 }
 
-snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t drv_frames)
+static snd_pcm_sframes_t plug_client_size(struct snd_pcm_substream *plug,
+                                         snd_pcm_uframes_t drv_frames,
+                                         bool check_size)
 {
        struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
        int stream;
@@ -209,7 +211,7 @@ snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_p
        if (stream == SNDRV_PCM_STREAM_PLAYBACK) {
                plugin = snd_pcm_plug_last(plug);
                while (plugin && drv_frames > 0) {
-                       if (drv_frames > plugin->buf_frames)
+                       if (check_size && drv_frames > plugin->buf_frames)
                                drv_frames = plugin->buf_frames;
                        plugin_prev = plugin->prev;
                        if (plugin->src_frames)
@@ -222,7 +224,7 @@ snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_p
                        plugin_next = plugin->next;
                        if (plugin->dst_frames)
                                drv_frames = plugin->dst_frames(plugin, drv_frames);
-                       if (drv_frames > plugin->buf_frames)
+                       if (check_size && drv_frames > plugin->buf_frames)
                                drv_frames = plugin->buf_frames;
                        plugin = plugin_next;
                }
@@ -231,7 +233,9 @@ snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug, snd_p
        return drv_frames;
 }
 
-snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pcm_uframes_t clt_frames)
+static snd_pcm_sframes_t plug_slave_size(struct snd_pcm_substream *plug,
+                                        snd_pcm_uframes_t clt_frames,
+                                        bool check_size)
 {
        struct snd_pcm_plugin *plugin, *plugin_prev, *plugin_next;
        snd_pcm_sframes_t frames;
@@ -252,14 +256,14 @@ snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pc
                                if (frames < 0)
                                        return frames;
                        }
-                       if (frames > plugin->buf_frames)
+                       if (check_size && frames > plugin->buf_frames)
                                frames = plugin->buf_frames;
                        plugin = plugin_next;
                }
        } else if (stream == SNDRV_PCM_STREAM_CAPTURE) {
                plugin = snd_pcm_plug_last(plug);
                while (plugin) {
-                       if (frames > plugin->buf_frames)
+                       if (check_size && frames > plugin->buf_frames)
                                frames = plugin->buf_frames;
                        plugin_prev = plugin->prev;
                        if (plugin->src_frames) {
@@ -274,6 +278,18 @@ snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug, snd_pc
        return frames;
 }
 
+snd_pcm_sframes_t snd_pcm_plug_client_size(struct snd_pcm_substream *plug,
+                                          snd_pcm_uframes_t drv_frames)
+{
+       return plug_client_size(plug, drv_frames, false);
+}
+
+snd_pcm_sframes_t snd_pcm_plug_slave_size(struct snd_pcm_substream *plug,
+                                         snd_pcm_uframes_t clt_frames)
+{
+       return plug_slave_size(plug, clt_frames, false);
+}
+
 static int snd_pcm_plug_formats(const struct snd_mask *mask,
                                snd_pcm_format_t format)
 {
@@ -630,7 +646,7 @@ snd_pcm_sframes_t snd_pcm_plug_write_transfer(struct snd_pcm_substream *plug, st
                src_channels = dst_channels;
                plugin = next;
        }
-       return snd_pcm_plug_client_size(plug, frames);
+       return plug_client_size(plug, frames, true);
 }
 
 snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, struct snd_pcm_plugin_channel *dst_channels_final, snd_pcm_uframes_t size)
@@ -640,7 +656,7 @@ snd_pcm_sframes_t snd_pcm_plug_read_transfer(struct snd_pcm_substream *plug, str
        snd_pcm_sframes_t frames = size;
        int err;
 
-       frames = snd_pcm_plug_slave_size(plug, frames);
+       frames = plug_slave_size(plug, frames, true);
        if (frames < 0)
                return frames;