compat-exiv2-026/exiv2-CVE-2018-11531.patch
2023-02-27 12:30:00 -05:00

32 lines
1.3 KiB
Diff

diff --git a/src/preview.cpp b/src/preview.cpp
index c34c8bd..69f8e01 100644
--- a/src/preview.cpp
+++ b/src/preview.cpp
@@ -36,6 +36,7 @@ EXIV2_RCSID("@(#) $Id$")
#include "preview.hpp"
#include "futils.hpp"
+#include "enforce.hpp"
#include "image.hpp"
#include "cr2image.hpp"
@@ -807,13 +808,14 @@ namespace {
else {
// FIXME: the buffer is probably copied twice, it should be optimized
DataBuf buf(size_);
- Exiv2::byte* pos = buf.pData_;
+ uint32_t idxBuf = 0;
for (int i = 0; i < sizes.count(); i++) {
uint32_t offset = dataValue.toLong(i);
uint32_t size = sizes.toLong(i);
- if (offset + size <= static_cast<uint32_t>(io.size()))
- memcpy(pos, base + offset, size);
- pos += size;
+ enforce(idxBuf + size < size_, kerCorruptedMetadata);
+ if (size!=0 && offset + size <= static_cast<uint32_t>(io.size()))
+ memcpy(&buf.pData_[idxBuf], base + offset, size);
+ idxBuf += size;
}
dataValue.setDataArea(buf.pData_, buf.size_);
}