comedi: Flush partial mappings in error case

commit ce8f9fb6 upstream.

If some remap_pfn_range() calls succeeded before one failed, we still have
buffer pages mapped into the userspace page tables when we drop the buffer
reference with comedi_buf_map_put(bm). The userspace mappings are only
cleaned up later in the mmap error path.

Fix it by explicitly flushing all mappings in our VMA on the error path.

See commit 79a61cc3 ("mm: avoid leaving partial pfn mappings around in
error case").

Cc: stable@vger.kernel.org
Fixes: ed9eccbe ("Staging: add comedi core")
Signed-off-by: Jann Horn <jannh@google.com>
Link: https://lore.kernel.org/r/20241017-comedi-tlb-v3-1-16b82f9372ce@google.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>