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f2fs: should put a page beyond EOF when preparing a write

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[ Upstream commit 9605f75cf3 ]

The prepare_compress_overwrite() gets/locks a page to prepare a read, and calls
f2fs_read_multi_pages() which checks EOF first. If there's any page beyond EOF,
we unlock the page and set cc->rpages[i] = NULL, which we can't put the page
anymore. This makes page leak, so let's fix by putting that page.

Fixes: a949dc5f2c ("f2fs: compress: fix race condition of overwrite vs truncate")
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Jaegeuk Kim 2021-08-30 13:30:45 -07:00 • committed by Greg Kroah-Hartman
parent 957c40ec56
commit 8c66f86b42
1 changed files with 2 additions and 0 deletions
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2
fs/f2fs/data.c
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@ -2153,6 +2153,8 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
continue;
}
unlock_page(page);
if (for_write)
put_page(page);
cc->rpages[i] = NULL;
cc->nr_rpages--;
}