* process.c (wait_reading_process_output): Avoid int overflow

when reading more than 2 GiB total from a process.

1 files changed, 4 insertions, 7 deletions

diff --git a/src/process.c b/src/process.c
index c61a22c4beb..0631cb732bf 100644
--- a/src/process.c
+++ b/src/process.c
@@ -4430,7 +4430,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
           && ! EQ (wait_proc->status, Qrun)
           && ! EQ (wait_proc->status, Qconnect))
         {
-          int nread, total_nread = 0;
+          bool read_some_bytes = 0;
 
           clear_waiting_for_input ();
           XSETPROCESS (proc, wait_proc);
@@ -4438,16 +4438,13 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
           /* Read data from the process, until we exhaust it.  */
           while (wait_proc->infd >= 0)
             {
-              nread = read_process_output (proc, wait_proc->infd);
+              int nread = read_process_output (proc, wait_proc->infd);
 
               if (nread == 0)
                 break;
 
               if (nread > 0)
-                {
-                  total_nread += nread;
-                  got_some_input = 1;
-                }
+                got_some_input = read_some_bytes = 1;
               else if (nread == -1 && (errno == EIO || errno == EAGAIN))
                 break;
 #ifdef EWOULDBLOCK
@@ -4455,7 +4452,7 @@ wait_reading_process_output (intmax_t time_limit, int nsecs, int read_kbd,
                 break;
 #endif
             }
-          if (total_nread > 0 && do_display)
+          if (read_some_bytes && do_display)
             redisplay_preserve_echo_area (10);
 
           break;