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b9880ec496
There could be a potential race between these two paths below,
leading to use-after-free when accessing bio->bi_crypt_context.
f2fs_write_cache_pages
->f2fs_do_write_data_page on page#1
->f2fs_inplace_write_data
->f2fs_merge_page_bio
->add_bio_entry
->f2fs_do_write_data_page on page#2
->f2fs_inplace_write_data
->f2fs_merge_page_bio
->f2fs_crypt_mergeable_bio
->fscrypt_mergeable_bio
f2fs_write_begin on page#1
->f2fs_wait_on_page_writeback
->f2fs_submit_merged_ipu_write
->__submit_bio
The bio gets completed, calling
bio_endio
->bio_uninit
->bio_crypt_free_ctx
->use-after-free issue
Fix this by moving f2fs_crypt_mergeable_bio() check within
add_ipu_page() so that it's done under bio_list_lock to prevent
the above race.
Bug: 137270441
Link: https://lore.kernel.org/linux-f2fs-devel/1592193588-21701-1-git-send-email-stummala@codeaurora.org/
Fixes: fb710731b6 ("f2fs: add inline encryption support")
Signed-off-by: Sahitya Tummala <stummala@codeaurora.org>
Signed-off-by: Satya Tangirala <satyat@google.com>
Change-Id: I1bd2cfa430423ba2a8d7c1da505322ded097cd9e
Linux kernel
============
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See Documentation/00-INDEX for a list of what is contained in each file.
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