[openexr] rewind streams between readSingle and readMulti (#4443)

Signed-off-by: Peter Hillman <peter@pedro.kiwi>

3 files changed, 30 insertions, 15 deletions

diff --git a/projects/openexr/openexr_deepscanlines_fuzzer.cc b/projects/openexr/openexr_deepscanlines_fuzzer.cc
index a91671e4..c5b2e4ce 100644
--- a/projects/openexr/openexr_deepscanlines_fuzzer.cc
+++ b/projects/openexr/openexr_deepscanlines_fuzzer.cc
@@ -164,10 +164,16 @@ extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   std::vector<char> buffer = stream.ConsumeRemainingBytes<char>();
 
   const std::string s(buffer.data(), buffer.size());
-  StdISStream is;
-  is.str(s);
 
-  readFileSingle(is, width, height);
-  readFileMulti(is);
+  {
+    StdISStream is;
+    is.str(s);
+    readFileSingle(is, width, height);
+  }
+  {
+    StdISStream is;
+    is.str(s);
+    readFileMulti(is);
+  }
   return 0;
 }
diff --git a/projects/openexr/openexr_deeptiles_fuzzer.cc b/projects/openexr/openexr_deeptiles_fuzzer.cc
index 27a79fae..f1ec7e60 100644
--- a/projects/openexr/openexr_deeptiles_fuzzer.cc
+++ b/projects/openexr/openexr_deeptiles_fuzzer.cc
@@ -165,12 +165,16 @@ static void readFileMulti(IStream& is) {
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
 
   const std::string s(reinterpret_cast<const char*>(data), size);
-  StdISStream is;
-  is.str(s);
-
   Header::setMaxImageSize(10000, 10000);
-  readFileSingle(is);
-  readFileMulti(is);
-
+  {
+    StdISStream is;
+    is.str(s);
+    readFileSingle(is);
+  }
+  {
+    StdISStream is;
+    is.str(s);
+    readFileMulti(is);
+  }
   return 0;
 }
diff --git a/projects/openexr/openexr_scanlines_fuzzer.cc b/projects/openexr/openexr_scanlines_fuzzer.cc
index 8f2d61b9..e41f1f2a 100644
--- a/projects/openexr/openexr_scanlines_fuzzer.cc
+++ b/projects/openexr/openexr_scanlines_fuzzer.cc
@@ -97,10 +97,15 @@ static void readMulti(IStream& is) {
 
 extern "C" int LLVMFuzzerTestOneInput(const uint8_t *data, size_t size) {
   const std::string s(reinterpret_cast<const char*>(data), size);
-  StdISStream is;
-  is.str(s);
-
-  readSingle(is);
-  readMulti(is);
+  {
+    StdISStream is;
+    is.str(s);
+    readSingle(is);
+  }
+  {  
+    StdISStream is;
+    is.str(s);
+    readMulti(is);
+  }
   return 0;
 }