Fix 32-bit segfault in m4ri

build/pkgs/m4ri/patches/b178ed36bdd841a76b6595edb77631886e099406.patch

@@ -0,0 +1,45 @@
+From b178ed36bdd841a76b6595edb77631886e099406 Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Gonzalo=20Tornar=C3=ADa?= <tornaria@cmat.edu.uy>
+Date: Mon, 3 Feb 2025 17:19:37 -0300
+Subject: [PATCH] Fix overflows in `mzd_init()`
+
+---
+ m4ri/mmc.h | 4 ++++
+ m4ri/mzd.c | 5 ++---
+ 2 files changed, 6 insertions(+), 3 deletions(-)
+
+diff --git a/m4ri/mmc.h b/m4ri/mmc.h
+index e6db4ca..3e97391 100644
+--- a/m4ri/mmc.h
++++ b/m4ri/mmc.h
+@@ -72,6 +72,10 @@ typedef struct _mm_block {
+  * \return Pointer to allocated memory block.
+  */
+ static inline void *m4ri_mmc_calloc(size_t count, size_t size) {
++  if (size && count > SIZE_MAX/size) {
++      m4ri_die("m4ri_mmc_calloc: overflow in multiplication\n");
++      return NULL; /* unreachable */
++  }
+   size_t total_size = count * size;
+   void *ret         = m4ri_mmc_malloc(total_size);
+   memset((char *)ret, 0, total_size);
+diff --git a/m4ri/mzd.c b/m4ri/mzd.c
+index ba04b7c..ac62c5c 100644
+--- a/m4ri/mzd.c
++++ b/m4ri/mzd.c
+@@ -144,13 +144,12 @@ mzd_t *mzd_init(rci_t r, rci_t c) {
+   mzd_t *A = mzd_t_malloc();
+   A->nrows         = r;
+   A->ncols         = c;
+-  A->width         = (c + m4ri_radix - 1) / m4ri_radix;
++  A->width         = c > 0 ? (c - 1) / m4ri_radix + 1 : 0;
+   A->rowstride     = ((A->width & 1) == 0) ? A->width : A->width + 1;
+   A->high_bitmask  = __M4RI_LEFT_BITMASK(c % m4ri_radix);
+   A->flags         = (A->high_bitmask != m4ri_ffff) ? mzd_flag_nonzero_excess : 0;
+   if (r && c) {
+-    size_t block_words = r * A->rowstride;
+-    A->data = m4ri_mmc_calloc(block_words, sizeof(word));
++    A->data = m4ri_mmc_calloc(r, sizeof(word) * A->rowstride);
+   } else {
+     A->data = NULL;
+   }