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Date: Sat, 12 Feb 2022 02:04:11 -0500
From: Wenqing Liu <>
Subject: CVE-2021-44879: kernel:NULL pointer dereference in

In move_data_page in fs/f2fs/gc.c in the Linux kernel 5.15.1-5.15.16, 
there is an NULL pointer dereference when f2fs tries to migrate a block 
that belong to special file, and the file doesn't have assigned address 
space operations pointer array for mapping->a_ops field but called 
a_ops->set_dirty_page(). Could cause denial of service when mounting and 
operate on the crafted image.


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