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dm thin metadata: Fix use-after-free in dm_bm_set_read_only
commit 3a653b205f
upstream.
The following error ocurred when testing disk online/offline:
[ 301.798344] device-mapper: thin: 253:5: aborting current metadata transaction
[ 301.848441] device-mapper: thin: 253:5: failed to abort metadata transaction
[ 301.849206] Aborting journal on device dm-26-8.
[ 301.850489] EXT4-fs error (device dm-26) in __ext4_new_inode:943: Journal has aborted
[ 301.851095] EXT4-fs (dm-26): Delayed block allocation failed for inode 398742 at logical offset 181 with max blocks 19 with error 30
[ 301.854476] BUG: KASAN: use-after-free in dm_bm_set_read_only+0x3a/0x40 [dm_persistent_data]
Reason is:
metadata_operation_failed
abort_transaction
dm_pool_abort_metadata
__create_persistent_data_objects
r = __open_or_format_metadata
if (r) --> If failed will free pmd->bm but pmd->bm not set NULL
dm_block_manager_destroy(pmd->bm);
set_pool_mode
dm_pool_metadata_read_only(pool->pmd);
dm_bm_set_read_only(pmd->bm); --> use-after-free
Add checks to see if pmd->bm is NULL in dm_bm_set_read_only and
dm_bm_set_read_write functions. If bm is NULL it means creating the
bm failed and so dm_bm_is_read_only must return true.
Signed-off-by: Ye Bin <yebin10@huawei.com>
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
parent
cfe85a4a85
commit
291144f111
2 changed files with 9 additions and 7 deletions
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@ -958,7 +958,7 @@ int dm_pool_metadata_close(struct dm_pool_metadata *pmd)
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}
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pmd_write_lock_in_core(pmd);
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if (!dm_bm_is_read_only(pmd->bm) && !pmd->fail_io) {
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if (!pmd->fail_io && !dm_bm_is_read_only(pmd->bm)) {
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r = __commit_transaction(pmd);
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if (r < 0)
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DMWARN("%s: __commit_transaction() failed, error = %d",
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@ -493,7 +493,7 @@ int dm_bm_write_lock(struct dm_block_manager *bm,
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void *p;
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int r;
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if (bm->read_only)
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if (dm_bm_is_read_only(bm))
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return -EPERM;
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p = dm_bufio_read(bm->bufio, b, (struct dm_buffer **) result);
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@ -562,7 +562,7 @@ int dm_bm_write_lock_zero(struct dm_block_manager *bm,
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struct buffer_aux *aux;
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void *p;
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if (bm->read_only)
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if (dm_bm_is_read_only(bm))
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return -EPERM;
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p = dm_bufio_new(bm->bufio, b, (struct dm_buffer **) result);
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@ -602,7 +602,7 @@ EXPORT_SYMBOL_GPL(dm_bm_unlock);
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int dm_bm_flush(struct dm_block_manager *bm)
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{
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if (bm->read_only)
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if (dm_bm_is_read_only(bm))
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return -EPERM;
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return dm_bufio_write_dirty_buffers(bm->bufio);
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@ -616,19 +616,21 @@ void dm_bm_prefetch(struct dm_block_manager *bm, dm_block_t b)
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bool dm_bm_is_read_only(struct dm_block_manager *bm)
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{
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return bm->read_only;
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return (bm ? bm->read_only : true);
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}
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EXPORT_SYMBOL_GPL(dm_bm_is_read_only);
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void dm_bm_set_read_only(struct dm_block_manager *bm)
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{
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bm->read_only = true;
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if (bm)
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bm->read_only = true;
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}
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EXPORT_SYMBOL_GPL(dm_bm_set_read_only);
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void dm_bm_set_read_write(struct dm_block_manager *bm)
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{
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bm->read_only = false;
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if (bm)
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bm->read_only = false;
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}
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EXPORT_SYMBOL_GPL(dm_bm_set_read_write);
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