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From: Jonathan Wakely <redi@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r10-9939] libstdc++: Fix null dereference in pb_ds containers Date: Fri, 18 Jun 2021 12:56:39 +0000 (GMT) [thread overview] Message-ID: <20210618125639.421C6383D031@sourceware.org> (raw) https://gcc.gnu.org/g:94712f96ec4be85d3dbdb3647c64268227519987 commit r10-9939-g94712f96ec4be85d3dbdb3647c64268227519987 Author: Jonathan Wakely <jwakely@redhat.com> Date: Tue May 4 15:46:28 2021 +0100 libstdc++: Fix null dereference in pb_ds containers This fixes ubsan errors: ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp:533:15: runtime error: member access within null pointer of type 'struct entry' libstdc++-v3/ChangeLog: * include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp (find_key_pointer(key_const_reference, false_type)) (find_key_pointer(key_const_reference, true_type)): Do not dereference null pointer. (cherry picked from commit ca871701c2822c3c4537745d4aa44a7b8f408337) Diff: --- .../pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp | 26 +++++++++++++--------- 1 file changed, 16 insertions(+), 10 deletions(-) diff --git a/libstdc++-v3/include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp b/libstdc++-v3/include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp index a46b23f4699..3787526a3a7 100644 --- a/libstdc++-v3/include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp +++ b/libstdc++-v3/include/ext/pb_ds/detail/cc_hash_table_map_/cc_ht_map_.hpp @@ -524,13 +524,16 @@ namespace __gnu_pbds resize_base::notify_find_search_end(); -#ifdef _GLIBCXX_DEBUG if (p_e == 0) - PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key) + { + PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key) + return 0; + } else - PB_DS_CHECK_KEY_EXISTS(r_key) -#endif - return &p_e->m_value; + { + PB_DS_CHECK_KEY_EXISTS(r_key) + return &p_e->m_value; + } } inline pointer @@ -550,13 +553,16 @@ namespace __gnu_pbds resize_base::notify_find_search_end(); -#ifdef _GLIBCXX_DEBUG if (p_e == 0) - PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key) + { + PB_DS_CHECK_KEY_DOES_NOT_EXIST(r_key) + return 0; + } else - PB_DS_CHECK_KEY_EXISTS(r_key) -#endif - return &p_e->m_value; + { + PB_DS_CHECK_KEY_EXISTS(r_key) + return &p_e->m_value; + } } inline bool
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