From: Eugene Syromyatnikov <evgsyr@gmail.com>
Date: Wed, 14 Mar 2018 20:08:34 +0000 (+0100)
Subject: btrfs: use umove_or_printaddr_ignore_syserror instead of u_error mangling
X-Git-Tag: v4.23~322
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=7db513885a2cd6c9b9c88861321563cf5d1c37fc;p=strace

btrfs: use umove_or_printaddr_ignore_syserror instead of u_error mangling

* btrfs.c (MPERS_PRINTER_DECL(btrfs_ioctl)) <case
BTRFS_IOC_TREE_SEARCH_V2>: Use umove_or_printaddr_ignore_syserror
instead of tcp->u_error mangling around umove_or_printaddr call.
---

diff --git a/btrfs.c b/btrfs.c
index 6f47a34a..b59ba2c7 100644
--- a/btrfs.c
+++ b/btrfs.c
@@ -1181,11 +1181,10 @@ MPERS_PRINTER_DECL(int, btrfs_ioctl,
 		else if (syserror(tcp)) {
 			if (tcp->u_error == EOVERFLOW) {
 				tprints(" => ");
-				tcp->u_error = 0;
-				if (!umove_or_printaddr(tcp, arg, &args))
+				if (!umove_or_printaddr_ignore_syserror(tcp,
+				    arg, &args))
 					tprintf("{buf_size=%" PRIu64 "}",
 						(uint64_t)args.buf_size);
-				tcp->u_error = EOVERFLOW;
 			}
 			break;
 		} else