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Commit8b7b2eb

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minchanktorvalds
authored andcommitted
mm: validate inode in mapping_set_error()
The swap address_space doesn't have host. Thus, it makes kernel crash onceswap write meets error. Fix it.Fixes:735e4ae ("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.orgSigned-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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‎include/linux/pagemap.h‎

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -54,7 +54,8 @@ static inline void mapping_set_error(struct address_space *mapping, int error)
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__filemap_set_wb_err(mapping,error);
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/* Record it in superblock */
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errseq_set(&mapping->host->i_sb->s_wb_err,error);
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if (mapping->host)
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errseq_set(&mapping->host->i_sb->s_wb_err,error);
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/* Record it in flags for now, for legacy callers */
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if (error==-ENOSPC)

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