Fix Heap-buffer-overflow WRITE in H5MM_memcpy (#3368)

HDFGroup · Aug 23, 2023 · 0b2e11d · 0b2e11d
1 parent e1602a2
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diff --git a/release_docs/RELEASE.txt b/release_docs/RELEASE.txt
@@ -589,6 +589,10 @@ Bug Fixes since HDF5-1.14.0 release
 
       Fixes Github issue #3034
 
+    - Fixed write buffer overflow in H5O__alloc_chunk
+
+      The overflow was found by OSS-Fuzz https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=58658
+
     Java Library
     ------------
     - Fixed switch case 'L' block missing a break statement.

diff --git a/src/H5Oalloc.c b/src/H5Oalloc.c
@@ -946,6 +946,9 @@ H5O__alloc_chunk(H5F_t *f, H5O_t *oh, size_t size, size_t found_null, const H5O_
                     else {
                         assert(curr_msg->type->id != H5O_CONT_ID);
 
+                        if (size < curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh))
+                            HGOTO_ERROR(H5E_OHDR, H5E_BADVALUE, FAIL, "invalid size");
+
                         /* Copy the raw data */
                         H5MM_memcpy(p, curr_msg->raw - (size_t)H5O_SIZEOF_MSGHDR_OH(oh),
                                     curr_msg->raw_size + (size_t)H5O_SIZEOF_MSGHDR_OH(oh));