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Leave chain in ngx_chain_add_copy() in consistent state on errors.
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@ -137,6 +137,7 @@ ngx_chain_add_copy(ngx_pool_t *pool, ngx_chain_t **chain, ngx_chain_t *in)
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while (in) {
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cl = ngx_alloc_chain_link(pool);
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if (cl == NULL) {
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*ll = NULL;
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return NGX_ERROR;
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}
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