From 6cdad1f133475f2bff0dfe2fbe90c351df3ea61d Mon Sep 17 00:00:00 2001 From: Jeff King Date: Tue, 7 Mar 2017 08:35:34 -0500 Subject: receive-pack: fix deadlock when we cannot create tmpdir The err_fd descriptor passed to the unpack() function is intended to be handed off to the child index-pack, and our async muxer will read until it gets EOF. However, if we encounter an error before handing off the descriptor, we must manually close(err_fd). Otherwise we will be waiting for our muxer to finish, while the muxer is waiting for EOF on err_fd. We fixed an identical deadlock already in 49ecfa13f (receive-pack: close sideband fd on early pack errors, 2013-04-19). But since then, the function grew a new early-return in 722ff7f87 (receive-pack: quarantine objects until pre-receive accepts, 2016-10-03), when we fail to create a temporary directory. This return needs the same treatment. Reported-by: Horst Schirmeier Signed-off-by: Jeff King Signed-off-by: Junio C Hamano diff --git a/builtin/receive-pack.c b/builtin/receive-pack.c index e6b3879..eb6d25a 100644 --- a/builtin/receive-pack.c +++ b/builtin/receive-pack.c @@ -1664,8 +1664,11 @@ static const char *unpack(int err_fd, struct shallow_info *si) } tmp_objdir = tmp_objdir_create(); - if (!tmp_objdir) + if (!tmp_objdir) { + if (err_fd > 0) + close(err_fd); return "unable to create temporary object directory"; + } child.env = tmp_objdir_env(tmp_objdir); /* -- cgit v0.10.2-6-g49f6