[PATCH] gdb/remote: make tid/pid type long in wite_ptid

[PATCH] gdb/remote: make tid/pid type long in wite_ptid

[Evgeniy Didin]

From: Evgeniy Didin <didin@synopsys.com>

In Zephyr RTOS the k_thread_create function returns
thread ID which is actually pointer to k_thread structure.
If the memory addressing starts from 0x80000000, passing such
big values to write_ptid() leads to overflow of "int tid" variable
and thread ID becomes negative.
So lets make tid/pid variables type "long", this will prevent overflow
and should not break any logic.

gdb/ChangeLog:

2019-11-09  Evgeniy Didin <didin@synopsys.com>

        * remote.c (remote_target::write_ptid): Make tid,pid
        variables type "long" to prevent overflow.

Signed-off-by: Evgeniy Didin <didin@synopsys.com>
Cc: linux-snps-arc@lists.infradead.org
---
 gdb/ChangeLog |  5 +++++
 gdb/remote.c  | 10 +++++-----
 2 files changed, 10 insertions(+), 5 deletions(-)

diff --git a/gdb/ChangeLog b/gdb/ChangeLog
index f5c8a76c0f..5581df877b 100644
--- a/gdb/ChangeLog
+++ b/gdb/ChangeLog
@@ -1,3 +1,8 @@
+2019-11-09  Evgeniy Didin <didin@synopsys.com>
+
+	* remote.c (remote_target::write_ptid): Make tid,pid
+	variables type "long" to prevent overflow.
+
 2019-11-08  Tom Tromey  <tromey@adacore.com>
 
 	* top.c (read_command_file): Update.
diff --git a/gdb/remote.c b/gdb/remote.c
index 1ac9013408..19602508f7 100644
--- a/gdb/remote.c
+++ b/gdb/remote.c
@@ -2909,22 +2909,22 @@ static int remote_newthread_step (threadref *ref, void *context);
 char *
 remote_target::write_ptid (char *buf, const char *endbuf, ptid_t ptid)
 {
-  int pid, tid;
+  long pid, tid;
   struct remote_state *rs = get_remote_state ();
 
   if (remote_multi_process_p (rs))
     {
       pid = ptid.pid ();
       if (pid < 0)
-	buf += xsnprintf (buf, endbuf - buf, "p-%x.", -pid);
+	buf += xsnprintf (buf, endbuf - buf, "p-%lx.", -pid);
       else
-	buf += xsnprintf (buf, endbuf - buf, "p%x.", pid);
+	buf += xsnprintf (buf, endbuf - buf, "p%lx.", pid);
     }
   tid = ptid.lwp ();
   if (tid < 0)
-    buf += xsnprintf (buf, endbuf - buf, "-%x", -tid);
+    buf += xsnprintf (buf, endbuf - buf, "-%lx", -tid);
   else
-    buf += xsnprintf (buf, endbuf - buf, "%x", tid);
+    buf += xsnprintf (buf, endbuf - buf, "%lx", tid);
 
   return buf;
 }
-- 
2.16.2


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