From: Eugene Syromyatnikov <evgsyr@gmail.com>
Date: Thu, 29 Sep 2016 12:57:55 +0000 (+0300)
Subject: io: handle data_size of -1 as unlimited data in print_iovec
X-Git-Tag: v4.14~20
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=f3228d32681b96b8e39af9c71af46e162f2f0b83;p=strace

io: handle data_size of -1 as unlimited data in print_iovec

Otherwise it can be depleted and print_iovec starts printing empty
strings.

* io.c (print_iovec): Interpret c->data_size of -1 as unlimited data
and do not decrease it in this case.
---

diff --git a/io.c b/io.c
index 907f9d24..8a93cb89 100644
--- a/io.c
+++ b/io.c
@@ -85,13 +85,15 @@ print_iovec(struct tcb *tcp, void *elem_buf, size_t elem_size, void *data)
 		case IOV_DECODE_STR:
 			if (len > c->data_size)
 				len = c->data_size;
-			c->data_size -= len;
+			if (c->data_size != (unsigned long) -1L)
+				c->data_size -= len;
 			printstr(tcp, iov[0], len);
 			break;
 		case IOV_DECODE_NETLINK:
 			if (len > c->data_size)
 				len = c->data_size;
-			c->data_size -= len;
+			if (c->data_size != (unsigned long) -1L)
+				c->data_size -= len;
 			decode_netlink(tcp, iov[0], iov[1]);
 			break;
 		default: