Subject: formats+aiff: reject implausibly large number of channels
From: Helmut Grohne <helmut () subdivi de>

--- a/src/formats_i.c
+++ b/src/formats_i.c
@@ -19,6 +19,7 @@
  */
 
 #include "sox_i.h"
+#include <limits.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <stdarg.h>
@@ -60,9 +61,14 @@
   if (ft->seekable)
     ft->data_start = lsx_tell(ft);
 
-  if (channels && ft->signal.channels && ft->signal.channels != channels)
+  if (channels && ft->signal.channels && ft->signal.channels != channels) {
     lsx_warn("`%s': overriding number of channels", ft->filename);
-  else ft->signal.channels = channels;
+  } else if (channels > SHRT_MAX) {
+    lsx_fail_errno(ft, EINVAL, "implausibly large number of channels");
+    return SOX_EOF;
+  } else {
+    ft->signal.channels = channels;
+  }
 
   if (rate && ft->signal.rate && ft->signal.rate != rate)
     lsx_warn("`%s': overriding sample rate", ft->filename);
--- sox-14.4.2+git20190427.orig/src/aiff.c
+++ sox-14.4.2+git20190427/src/aiff.c
@@ -609,6 +609,11 @@
            At 48 kHz, 16 bits stereo, this gives ~3 hours of audio.
            Sorry, the AIFF format does not provide for an indefinite
            number of samples. */
+        if (ft->signal.channels >= (0x7f000000 / (ft->encoding.bits_per_sample >> 3)))
+        {
+                lsx_fail_errno(ft, SOX_EOF, "too many channels for AIFF header");
+                return SOX_EOF;
+        }
         return(aiffwriteheader(ft, (uint64_t) 0x7f000000 / ((ft->encoding.bits_per_sample>>3)*ft->signal.channels)));
 }