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From c4ce2bb15a9df0a1b6a999612ccd053e67dc7083 Mon Sep 17 00:00:00 2001
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From: Pranith Kumar K <pkarampu@redhat.com>
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Date: Mon, 19 Mar 2018 12:09:18 +0530
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Subject: [PATCH 187/201] features/shard: Do list_del_init() while list memory
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is valid
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Problem:
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shard_post_lookup_fsync_handler() goes over the list of inode-ctx that need to
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be fsynced and in cbk it removes each of the inode-ctx from the list. When the
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first member of list is removed it tries to modifies list head's memory with
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the latest next/prev and when this happens, there is no guarantee that the
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list-head which is from stack memory of shard_post_lookup_fsync_handler() is
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valid.
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Fix:
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Do list_del_init() in the loop before winding fsync.
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>BUG: 1557876
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>Change-Id: If429d3634219e1a435bd0da0ed985c646c59c2ca
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>Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
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Upstream-patch: https://review.gluster.org/19737
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BUG: 1556895
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Change-Id: If429d3634219e1a435bd0da0ed985c646c59c2ca
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Signed-off-by: Pranith Kumar K <pkarampu@redhat.com>
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Reviewed-on: https://code.engineering.redhat.com/gerrit/133241
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Tested-by: RHGS Build Bot <nigelb@redhat.com>
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Reviewed-by: Sunil Kumar Heggodu Gopala Acharya <sheggodu@redhat.com>
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---
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xlators/features/shard/src/shard.c | 2 +-
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1 file changed, 1 insertion(+), 1 deletion(-)
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diff --git a/xlators/features/shard/src/shard.c b/xlators/features/shard/src/shard.c
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index a661345..945458e 100644
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--- a/xlators/features/shard/src/shard.c
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+++ b/xlators/features/shard/src/shard.c
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@@ -4521,7 +4521,6 @@ out:
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if (op_ret == 0)
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ctx->fsync_needed -= fsync_count;
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GF_ASSERT (ctx->fsync_needed >= 0);
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- list_del_init (&ctx->to_fsync_list);
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if (ctx->fsync_needed != 0) {
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list_add_tail (&ctx->to_fsync_list,
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&base_ictx->to_fsync_list);
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@@ -4596,6 +4595,7 @@ shard_post_lookup_fsync_handler (call_frame_t *frame, xlator_t *this)
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anon_fd = NULL;
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list_for_each_entry_safe (iter, tmp, ©, to_fsync_list) {
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+ list_del_init (&iter->to_fsync_list);
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fsync_count = 0;
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shard_inode_ctx_get_fsync_count (iter->inode, this,
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&fsync_count);
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--
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1.8.3.1
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