70 lines
2.9 KiB
Diff
70 lines
2.9 KiB
Diff
From 41ddc88a80160050b0ac1a51cb258f8918edf9aa Mon Sep 17 00:00:00 2001
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From: "Lucas A. M. Magalhaes" <lamm@linux.ibm.com>
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Date: Wed, 23 Jun 2021 15:05:50 -0300
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Subject: [PATCH] vector: Fix undefined behaviour on realloc
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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On tests listed bellow the reserve method is being called before any
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allocation on the object therefore realloc being called without
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any previous allocation. Inside realloc _data is being used with the
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operator '[]', as it is nullptr at that moment it's an undefined
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behaviour.
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This patch simply returns a call to alloc if _data is nullptr.
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This tests fails on PowerPC with Segmentation Fault because of this
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issue:
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segment_vector_array_expsize_assign_exceptions_oom_0_none
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segment_vector_array_expsize_assign_exceptions_oom_0_memcheck
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segment_vector_array_expsize_capacity_exceptions_oom_0_none
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segment_vector_array_expsize_capacity_exceptions_oom_0_memcheck
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segment_vector_array_expsize_modifiers_exceptions_oom_0_none
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segment_vector_array_expsize_modifiers_exceptions_oom_0_memcheck
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segment_vector_vector_expsize_assign_exceptions_oom_0_none
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segment_vector_vector_expsize_assign_exceptions_oom_0_memcheck
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segment_vector_vector_expsize_capacity_exceptions_oom_0_none
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segment_vector_vector_expsize_capacity_exceptions_oom_0_memcheck
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segment_vector_vector_expsize_modifiers_exceptions_oom_0_none
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segment_vector_vector_expsize_modifiers_exceptions_oom_0_memcheck
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segment_vector_vector_fixedsize_assign_exceptions_oom_0_none
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segment_vector_vector_fixedsize_assign_exceptions_oom_0_memcheck
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Signed-off-by: Lucas A. M. Magalhães lamm@linux.ibm.com
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---
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include/libpmemobj++/container/vector.hpp | 10 +++++++++-
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1 file changed, 9 insertions(+), 1 deletion(-)
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diff --git a/include/libpmemobj++/container/vector.hpp b/include/libpmemobj++/container/vector.hpp
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index f430ed50..9810220b 100644
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--- a/include/libpmemobj++/container/vector.hpp
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+++ b/include/libpmemobj++/container/vector.hpp
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@@ -2362,7 +2362,8 @@ vector<T>::internal_insert(size_type idx, InputIt first, InputIt last)
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* Private helper function. Must be called during transaction. Allocates new
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* memory for capacity_new number of elements and copies or moves old elements
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* to new memory area. If the current size is greater than capacity_new, the
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- * container is reduced to its first capacity_new elements.
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+ * container is reduced to its first capacity_new elements. If was never
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+ * allocated behaves as an alloc call.
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*
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* param[in] capacity_new new capacity.
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*
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@@ -2381,6 +2382,13 @@ vector<T>::realloc(size_type capacity_new)
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{
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assert(pmemobj_tx_stage() == TX_STAGE_WORK);
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+ /*
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+ * If _data == nullptr this object has never allocated any memory
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+ * so we need to behave as alloc instead.
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+ */
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+ if (_data == nullptr)
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+ return alloc(capacity_new);
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+
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/*
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* XXX: future optimization: we don't have to snapshot data
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* which we will not overwrite
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--
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2.27.0
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