Fix wrong alignment in tho allocator used in quic_stream test.

Wrong alignment observed on Solaris Sparc 10 (bus error).
THO_ALLOC_HDR has size 20 and memory for structures gets allocated at addresses
directly following a THO_ALLOC_HDR.

Backport needed for the 4.1 branch.

Fixes https://github.com/openssl/openssl/issues/33187

Reviewed-by: Eugene Syromiatnikov <[email protected]>
Reviewed-by: Nikola Pajkovsky <[email protected]>
Merge-date: Wed Oct 21 17:10:20 2026
Merged-from: https://github.com/openssl/openssl/pull/33204

1 files changed, 16 insertions, 2 deletions

diff --git a/test/quic_stream_test.c b/test/quic_stream_test.c
index dbb666973d0..1da50a3ee53 100644
--- a/test/quic_stream_test.c
+++ b/test/quic_stream_test.c
@@ -2870,7 +2870,17 @@ static CRYPTO_malloc_fn malloc_save;
 static CRYPTO_realloc_fn realloc_save;
 static CRYPTO_free_fn free_save;
 
-typedef struct tdc_alloc_hdr_st {
+#if defined(__GNUC__) || defined(__clang__)
+#define ALIGN_ALLOC_HDR __attribute((aligned(16)))
+#else
+#define ALIGN_ALLOC_HDR
+#endif
+
+/*
+ * Increased alignment is needed, as tdc_malloc() custom allocator
+ * returns memory addresses directly following a TDC_ALLOC_HDR.
+ */
+typedef struct ALIGN_ALLOC_HDR tdc_alloc_hdr_st {
     size_t size;
     OSSL_LIST_MEMBER(tdc, struct tdc_alloc_hdr_st);
 } TDC_ALLOC_HDR;
@@ -3156,7 +3166,11 @@ err:
     return ok;
 }
 
-typedef struct tho_alloc_hdr_st {
+/*
+ * Increased alignment is needed, as tho_malloc() custom allocator
+ * returns memory addresses directly following a THO_ALLOC_HDR.
+ */
+typedef struct ALIGN_ALLOC_HDR tho_alloc_hdr_st {
     size_t size;
     const char *file;
     int from_reas;