From 726217c7661f8158a919fa0ed6407cd24ff2bd6a Mon Sep 17 00:00:00 2001
From: Giacomo Tesio <giacomo@tesio.it>
Date: Tue, 21 Nov 2017 00:50:26 +0100
Subject: [PATCH] kern: fix proc ref counting in procread

---
 sys/src/kern/port/devproc.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)

diff --git a/sys/src/kern/port/devproc.c b/sys/src/kern/port/devproc.c
index cb1d129..5f2a76c 100644
--- a/sys/src/kern/port/devproc.c
+++ b/sys/src/kern/port/devproc.c
@@ -857,6 +857,7 @@ procread(Chan *c, void *va, long n, int64_t off)
 		return n;
 
 	case Qsyscall:
+		psdecref(p);
 		return qread(c->aux, va, n);
 
 	case Qmem:
@@ -949,13 +950,18 @@ procread(Chan *c, void *va, long n, int64_t off)
 		rptr = (uint8_t*)&p->fpsave;
 		rsize = sizeof(FPsave);
 	regread:
-		if(rptr == nil)
+		if(rptr == nil){
+			psdecref(p);
 			error(Enoreg);
-		if(offset >= rsize)
+		}
+		if(offset >= rsize){
+			psdecref(p);
 			return 0;
+		}
 		if(offset+n > rsize)
 			n = rsize - offset;
 		memmove(a, rptr+offset, n);
+		psdecref(p);
 		return n;
 
 	case Qstatus: