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| author | Minchan Kim <minchan@kernel.org> | 2020-10-10 23:16:37 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-10-14 11:55:59 +0200 |
| commit | 0d600018dde7ab4ae6d9625daa45826acef6bd61 (patch) | |
| tree | 874d24dd5fb7aac0cdcd0fcf22ae8b3ba44281a7 | |
| parent | 270974601ea5ad2e23cdd95b3a6e71e6a762eede (diff) | |
| download | linux-0d600018dde7ab4ae6d9625daa45826acef6bd61.tar.gz linux-0d600018dde7ab4ae6d9625daa45826acef6bd61.tar.bz2 linux-0d600018dde7ab4ae6d9625daa45826acef6bd61.zip | |
mm: validate inode in mapping_set_error()
commit 8b7b2eb131d3476062ffd34358785b44be25172f upstream.
The swap address_space doesn't have host. Thus, it makes kernel crash once
swap write meets error. Fix it.
Fixes: 735e4ae5ba28 ("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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | include/linux/pagemap.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index cf2468da68e9..601ad6957bb9 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -54,7 +54,8 @@ static inline void mapping_set_error(struct address_space *mapping, int error) __filemap_set_wb_err(mapping, error); /* Record it in superblock */ - errseq_set(&mapping->host->i_sb->s_wb_err, error); + if (mapping->host) + errseq_set(&mapping->host->i_sb->s_wb_err, error); /* Record it in flags for now, for legacy callers */ if (error == -ENOSPC) |