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receive-pack: fix deadlock when we cannot create tmpdir

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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 <horst@schirmeier.com>
Signed-off-by: Jeff King <peff@peff.net>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Jeff King 2017-03-07 08:35:34 -05:00 committed by Junio C Hamano
parent 454cb6bd52
commit 6cdad1f133
1 changed files with 4 additions and 1 deletions
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5
builtin/receive-pack.c
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@ -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);
/*