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b6e58b5466
remove_raw() in dm_btree_remove() may fail due to IO read error (e.g. read the content of origin block fails during shadowing), and the value of shadow_spine::root is uninitialized, but the uninitialized value is still assign to new_root in the end of dm_btree_remove(). For dm-thin, the value of pmd->details_root or pmd->root will become an uninitialized value, so if trying to read details_info tree again out-of-bound memory may occur as showed below: general protection fault, probably for non-canonical address 0x3fdcb14c8d7520 CPU: 4 PID: 515 Comm: dmsetup Not tainted 5.13.0-rc6 Hardware name: QEMU Standard PC RIP: 0010:metadata_ll_load_ie+0x14/0x30 Call Trace: sm_metadata_count_is_more_than_one+0xb9/0xe0 dm_tm_shadow_block+0x52/0x1c0 shadow_step+0x59/0xf0 remove_raw+0xb2/0x170 dm_btree_remove+0xf4/0x1c0 dm_pool_delete_thin_device+0xc3/0x140 pool_message+0x218/0x2b0 target_message+0x251/0x290 ctl_ioctl+0x1c4/0x4d0 dm_ctl_ioctl+0xe/0x20 __x64_sys_ioctl+0x7b/0xb0 do_syscall_64+0x40/0xb0 entry_SYSCALL_64_after_hwframe+0x44/0xae Fixing it by only assign new_root when removal succeeds Signed-off-by: Hou Tao <houtao1@huawei.com> Cc: stable@vger.kernel.org Signed-off-by: Mike Snitzer <snitzer@redhat.com> |
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| .. | ||
| dm-array.c | ||
| dm-array.h | ||
| dm-bitset.c | ||
| dm-bitset.h | ||
| dm-block-manager.c | ||
| dm-block-manager.h | ||
| dm-btree-internal.h | ||
| dm-btree-remove.c | ||
| dm-btree-spine.c | ||
| dm-btree.c | ||
| dm-btree.h | ||
| dm-persistent-data-internal.h | ||
| dm-space-map-common.c | ||
| dm-space-map-common.h | ||
| dm-space-map-disk.c | ||
| dm-space-map-disk.h | ||
| dm-space-map-metadata.c | ||
| dm-space-map-metadata.h | ||
| dm-space-map.h | ||
| dm-transaction-manager.c | ||
| dm-transaction-manager.h | ||
| Kconfig | ||
| Makefile | ||