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| author | Zhihao Cheng <chengzhihao1@huawei.com> | 2022-05-10 14:31:26 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2022-05-27 16:49:41 +0200 |
| commit | 8c03a1c21d72210f81cb369cc528e3fde4b45411 (patch) | |
| tree | 3522098526b91e0b24e51fa36ed869ba64939b4f | |
| parent | ubi: fastmap: Check wl_pool for free peb before wear leveling (diff) | |
| download | linux-8c03a1c21d72210f81cb369cc528e3fde4b45411.tar.xz linux-8c03a1c21d72210f81cb369cc528e3fde4b45411.zip | |
ubi: ubi_create_volume: Fix use-after-free when volume creation failed
There is an use-after-free problem for 'eba_tbl' in ubi_create_volume()'s
error handling path:
ubi_eba_replace_table(vol, eba_tbl)
vol->eba_tbl = tbl
out_mapping:
ubi_eba_destroy_table(eba_tbl) // Free 'eba_tbl'
out_unlock:
put_device(&vol->dev)
vol_release
kfree(tbl->entries) // UAF
Fix it by removing redundant 'eba_tbl' releasing.
Fetch a reproducer in [Link].
Fixes: 493cfaeaa0c9b ("mtd: utilize new cdev_device_add helper function")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=215965
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>
| -rw-r--r-- | drivers/mtd/ubi/vmt.c | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c index 1bc7b3a05604..6ea95ade4ca6 100644 --- a/drivers/mtd/ubi/vmt.c +++ b/drivers/mtd/ubi/vmt.c @@ -309,7 +309,6 @@ out_mapping: ubi->volumes[vol_id] = NULL; ubi->vol_count -= 1; spin_unlock(&ubi->volumes_lock); - ubi_eba_destroy_table(eba_tbl); out_acc: spin_lock(&ubi->volumes_lock); ubi->rsvd_pebs -= vol->reserved_pebs; |