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dm verity: initialize fec io before freeing it 

commit 7be05bdfb4efc1396f7692562c7161e2b9f595f1 upstream.

If BIO error, verity_end_io() can call verity_finish_io() before
verity_fec_init_io(). Therefore, fec_io->rs is not initialized and
may crash when doing memory freeing in verity_fec_finish_io().

Crash call stack:
 die+0x90/0x2b8
 __do_kernel_fault+0x260/0x298
 do_bad_area+0x2c/0xdc
 do_translation_fault+0x3c/0x54
 do_mem_abort+0x54/0x118
 el1_abort+0x38/0x5c
 el1h_64_sync_handler+0x50/0x90
 el1h_64_sync+0x64/0x6c
 free_rs+0x18/0xac
 fec_rs_free+0x10/0x24
 mempool_free+0x58/0x148
 verity_fec_finish_io+0x4c/0xb0
 verity_end_io+0xb8/0x150

Cc: stable@vger.kernel.org      # v6.0+
Fixes: 5721d4e5a9 ("dm verity: Add optional "try_verify_in_tasklet" feature")
Signed-off-by: Wu Bo <bo.wu@vivo.com>
Reviewed-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wu Bo 2023-11-21 20:51:49 -07:00 committed by Greg Kroah-Hartman
parent 7cfc3884a8
commit 6f5a9fc94b
1 changed files with 2 additions and 1 deletions
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3
drivers/md/dm-verity-target.c
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@ -631,7 +631,6 @@ static void verity_work(struct work_struct *w)
io->in_tasklet = false;
verity_fec_init_io(io);
verity_finish_io(io, errno_to_blk_status(verity_verify_io(io)));
}
@ -779,6 +778,8 @@ static int verity_map(struct dm_target *ti, struct bio *bio)
bio->bi_private = io;
io->iter = bio->bi_iter;
verity_fec_init_io(io);
verity_submit_prefetch(v, io);
submit_bio_noacct(bio);