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From a7a7d497af4230430f8a0cc54d8b49cfea260039 Mon Sep 17 00:00:00 2001
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From: Xavi Hernandez <xhernandez@redhat.com>
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Date: Tue, 25 Jun 2019 18:00:06 +0200
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Subject: [PATCH 207/221] glusterd: fix use-after-free of a dict_t
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A dict was passed to a function that calls dict_unref() without taking
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any additional reference. Given that the same dict is also used after
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the function returns, this was causing a use-after-free situation.
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To fix the issue, we simply take an additional reference before calling
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the function.
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Upstream patch:
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> BUG: 1723890
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> Upstream patch link: https://review.gluster.org/c/glusterfs/+/22943
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> Change-Id: I98c6b76b08fe3fa6224edf281a26e9ba1ffe3017
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> Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
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Change-Id: I98c6b76b08fe3fa6224edf281a26e9ba1ffe3017
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Updates: bz#1722801
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Signed-off-by: Xavi Hernandez <xhernandez@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/174656
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Atin Mukherjee <amukherj@redhat.com>
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---
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xlators/mgmt/glusterd/src/glusterd-utils.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/xlators/mgmt/glusterd/src/glusterd-utils.c b/xlators/mgmt/glusterd/src/glusterd-utils.c
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index c6e9bb0..4c487d0 100644
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--- a/xlators/mgmt/glusterd/src/glusterd-utils.c
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+++ b/xlators/mgmt/glusterd/src/glusterd-utils.c
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@@ -3697,7 +3697,7 @@ glusterd_add_volumes_to_export_dict(dict_t *peer_data, char **buf,
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if (totthread) {
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gf_log(this->name, GF_LOG_INFO,
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"Finished merger of all dictionraies into single one");
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- dict_arr[totthread++] = peer_data;
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+ dict_arr[totthread++] = dict_ref(peer_data);
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ret = glusterd_dict_arr_serialize(dict_arr, totthread, buf, length);
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gf_log(this->name, GF_LOG_INFO,
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"Serialize dictionary data return is %d", ret);
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--
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1.8.3.1
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