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* [gcc(refs/vendors/redhat/heads/gcc-10-branch)] libstdc++: Fix incorrect size calculation in PMR resource (PR 94906)
@ 2020-06-18 10:45 Jakub Jelinek
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From: Jakub Jelinek @ 2020-06-18 10:45 UTC (permalink / raw)
To: gcc-cvs, libstdc++-cvs
https://gcc.gnu.org/g:dc103060c18656affaecfdd57faa4e0237dadcd3
commit dc103060c18656affaecfdd57faa4e0237dadcd3
Author: Jonathan Wakely <jwakely@redhat.com>
Date: Tue May 12 09:54:44 2020 +0100
libstdc++: Fix incorrect size calculation in PMR resource (PR 94906)
Calculating the size of a chunk being returned to the upstream allocator
was done with a 32-bit type, so it wrapped if the chunk was 4GB or
larger.
I don't know how to test this without allocating 4GB, so there's no test
in the testsuite. It has been tested manually of course.
Backport from mainline
2020-05-04 Jonathan Wakely <jwakely@redhat.com>
PR libstdc++/94906
* src/c++17/memory_resource.cc
(monotonic_buffer_resource::_Chunk::release): Use size_t for shift
operands.
Diff:
---
libstdc++-v3/ChangeLog | 8 ++++++++
libstdc++-v3/src/c++17/memory_resource.cc | 4 ++--
2 files changed, 10 insertions(+), 2 deletions(-)
diff --git a/libstdc++-v3/ChangeLog b/libstdc++-v3/ChangeLog
index b37c19ace3b..d9c2ecf1ed4 100644
--- a/libstdc++-v3/ChangeLog
+++ b/libstdc++-v3/ChangeLog
@@ -1,5 +1,13 @@
2020-05-12 Jonathan Wakely <jwakely@redhat.com>
+ Backport from mainline
+ 2020-05-04 Jonathan Wakely <jwakely@redhat.com>
+
+ PR libstdc++/94906
+ * src/c++17/memory_resource.cc
+ (monotonic_buffer_resource::_Chunk::release): Use size_t for shift
+ operands.
+
Backport from mainline
2020-05-03 Jonathan Wakely <jwakely@redhat.com>
diff --git a/libstdc++-v3/src/c++17/memory_resource.cc b/libstdc++-v3/src/c++17/memory_resource.cc
index 56a87844da0..70c39881fa1 100644
--- a/libstdc++-v3/src/c++17/memory_resource.cc
+++ b/libstdc++-v3/src/c++17/memory_resource.cc
@@ -228,8 +228,8 @@ namespace pmr
if (__ch->_M_canary != (__ch->_M_size | __ch->_M_align))
return; // buffer overflow detected!
- size_t __size = (1u << __ch->_M_size);
- size_t __align = (1u << __ch->_M_align);
+ size_t __size = (size_t)1 << __ch->_M_size;
+ size_t __align = (size_t)1 << __ch->_M_align;
void* __start = (char*)(__ch + 1) - __size;
__r->deallocate(__start, __size, __align);
}
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