ALSA: usx2y: validate nrpacks module parameter on probe

The module parameter defines number of iso packets per one URB. User is
allowed to set any value to the parameter of type int, which can lead to
various kinds of weird and incorrect behavior like integer overflows,
truncations, etc. Number of packets should be a small non-negative number.

Since this parameter is read-only, its value can be validated on driver
probe.

Fixes: 1da177e4c3f4 ("Linux-2.6.12-rc2")
Signed-off-by: Murad Masimov <m.masimov@mt-integration.ru>
Link: https://patch.msgid.link/20250303100413.835-1-m.masimov@mt-integration.ru
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/usb/usx2y/usbusx2y.c b/sound/usb/usx2y/usbusx2y.c
index 5f81c68fd42b68f26709aaf47459eeb9988375d2..5756ff3528a2d396157da27a6b12675e8e857394 100644 (file)
--- a/sound/usb/usx2y/usbusx2y.c
+++ b/sound/usb/usx2y/usbusx2y.c
@@ -151,6 +151,12 @@ static int snd_usx2y_card_used[SNDRV_CARDS];
 static void snd_usx2y_card_private_free(struct snd_card *card);
 static void usx2y_unlinkseq(struct snd_usx2y_async_seq *s);
 
+#ifdef USX2Y_NRPACKS_VARIABLE
+int nrpacks = USX2Y_NRPACKS; /* number of packets per urb */
+module_param(nrpacks, int, 0444);
+MODULE_PARM_DESC(nrpacks, "Number of packets per URB.");
+#endif
+
 /*
  * pipe 4 is used for switching the lamps, setting samplerate, volumes ....
  */
@@ -432,6 +438,11 @@ static int snd_usx2y_probe(struct usb_interface *intf,
        struct snd_card *card;
        int err;
 
+#ifdef USX2Y_NRPACKS_VARIABLE
+       if (nrpacks < 0 || nrpacks > USX2Y_NRPACKS_MAX)
+               return -EINVAL;
+#endif
+
        if (le16_to_cpu(device->descriptor.idVendor) != 0x1604 ||
            (le16_to_cpu(device->descriptor.idProduct) != USB_ID_US122 &&
             le16_to_cpu(device->descriptor.idProduct) != USB_ID_US224 &&

diff --git a/sound/usb/usx2y/usbusx2y.h b/sound/usb/usx2y/usbusx2y.h
index 391fd7b4ed5ef6aaae298da9ed9d55688e677664..6a76d04bf1c7df2f917dd0dd15e1b8894bf58d58 100644 (file)
--- a/sound/usb/usx2y/usbusx2y.h
+++ b/sound/usb/usx2y/usbusx2y.h
@@ -7,6 +7,32 @@
 
 #define NRURBS         2
 
+/* Default value used for nr of packs per urb.
+ * 1 to 4 have been tested ok on uhci.
+ * To use 3 on ohci, you'd need a patch:
+ * look for "0000425-linux-2.6.9-rc4-mm1_ohci-hcd.patch.gz" on
+ * "https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000425"
+ *
+ * 1, 2 and 4 work out of the box on ohci, if I recall correctly.
+ * Bigger is safer operation, smaller gives lower latencies.
+ */
+#define USX2Y_NRPACKS 4
+
+#define USX2Y_NRPACKS_MAX 1024
+
+/* If your system works ok with this module's parameter
+ * nrpacks set to 1, you might as well comment
+ * this define out, and thereby produce smaller, faster code.
+ * You'd also set USX2Y_NRPACKS to 1 then.
+ */
+#define USX2Y_NRPACKS_VARIABLE 1
+
+#ifdef USX2Y_NRPACKS_VARIABLE
+extern int nrpacks;
+#define nr_of_packs() nrpacks
+#else
+#define nr_of_packs() USX2Y_NRPACKS
+#endif
 
 #define URBS_ASYNC_SEQ 10
 #define URB_DATA_LEN_ASYNC_SEQ 32

diff --git a/sound/usb/usx2y/usbusx2yaudio.c b/sound/usb/usx2y/usbusx2yaudio.c
index f540f46a0b143b15039a1a3d1036fc1ab8b17bd8..acca8bead82e5bc78cda6d7d2cd154bff50ca993 100644 (file)
--- a/sound/usb/usx2y/usbusx2yaudio.c
+++ b/sound/usb/usx2y/usbusx2yaudio.c
@@ -28,33 +28,6 @@
 #include "usx2y.h"
 #include "usbusx2y.h"
 
-/* Default value used for nr of packs per urb.
- * 1 to 4 have been tested ok on uhci.
- * To use 3 on ohci, you'd need a patch:
- * look for "0000425-linux-2.6.9-rc4-mm1_ohci-hcd.patch.gz" on
- * "https://bugtrack.alsa-project.org/alsa-bug/bug_view_page.php?bug_id=0000425"
- *
- * 1, 2 and 4 work out of the box on ohci, if I recall correctly.
- * Bigger is safer operation, smaller gives lower latencies.
- */
-#define USX2Y_NRPACKS 4
-
-/* If your system works ok with this module's parameter
- * nrpacks set to 1, you might as well comment
- * this define out, and thereby produce smaller, faster code.
- * You'd also set USX2Y_NRPACKS to 1 then.
- */
-#define USX2Y_NRPACKS_VARIABLE 1
-
-#ifdef USX2Y_NRPACKS_VARIABLE
-static int nrpacks = USX2Y_NRPACKS; /* number of packets per urb */
-#define  nr_of_packs() nrpacks
-module_param(nrpacks, int, 0444);
-MODULE_PARM_DESC(nrpacks, "Number of packets per URB.");
-#else
-#define nr_of_packs() USX2Y_NRPACKS
-#endif
-
 static int usx2y_urb_capt_retire(struct snd_usx2y_substream *subs)
 {
        struct urb      *urb = subs->completed_urb;