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block/qcow2-bitmap: Replace g_memdup() by g_memdup2()

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Per https://discourse.gnome.org/t/port-your-module-from-g-memdup-to-g-memdup2-now/5538

  The old API took the size of the memory to duplicate as a guint,
  whereas most memory functions take memory sizes as a gsize. This
  made it easy to accidentally pass a gsize to g_memdup(). For large
  values, that would lead to a silent truncation of the size from 64
  to 32 bits, and result in a heap area being returned which is
  significantly smaller than what the caller expects. This can likely
  be exploited in various modules to cause a heap buffer overflow.

Replace g_memdup() by the safer g_memdup2() wrapper.

Trivially safe because the argument was directly from sizeof.

Signed-off-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Message-Id: <20210903174510.751630-6-philmd@redhat.com>
Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
This commit is contained in:
Philippe Mathieu-Daudé 2021-09-03 11:59:27 +02:00 committed by Philippe Mathieu-Daudé
parent 4e66a08546
commit f9cc8cfdf3
1 changed files with 1 additions and 1 deletions
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block/qcow2-bitmap.c
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@ -1609,7 +1609,7 @@ bool qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs,
name);
goto fail;
}
tb = g_memdup(&bm->table, sizeof(bm->table));
tb = g_memdup2(&bm->table, sizeof(bm->table));
bm->table.offset = 0;
bm->table.size = 0;
QSIMPLEQ_INSERT_TAIL(&drop_tables, tb, entry);