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f2fs: should put a page beyond EOF when preparing a write
[ Upstream commit9605f75cf3
] 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>
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@ -2153,6 +2153,8 @@ int f2fs_read_multi_pages(struct compress_ctx *cc, struct bio **bio_ret,
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continue;
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}
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unlock_page(page);
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if (for_write)
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put_page(page);
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cc->rpages[i] = NULL;
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cc->nr_rpages--;
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}
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