Commit 8b7b2eb1 authored Oct 10, 2020 by Minchan Kim Committed by Linus Torvalds Oct 11, 2020

mm: validate inode in mapping_set_error()



The swap address_space doesn't have host. Thus, it makes kernel crash once
swap write meets error. Fix it.

Fixes: 735e4ae5 ("vfs: track per-sb writeback errors and report them to syncfs")
Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Jeff Layton <jlayton@kernel.org>
Cc: Jan Kara <jack@suse.cz>
Cc: Andres Freund <andres@anarazel.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Dave Chinner <david@fromorbit.com>
Cc: David Howells <dhowells@redhat.com>
Cc: <stable@vger.kernel.org>
Link: https://lkml.kernel.org/r/20201010000650.750063-1-minchan@kernel.org


Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent bc4fe4cd

include/linux/pagemap.h

+2 −1

Original line number	Diff line number	Diff line
		@@ -54,6 +54,7 @@ static inline void mapping_set_error(struct address_space *mapping, int error)
		__filemap_set_wb_err(mapping, error);

		/* Record it in superblock */
		if (mapping->host)
		errseq_set(&mapping->host->i_sb->s_wb_err, error);

		/* Record it in flags for now, for legacy callers */

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