diff options
| author | Eric Auger <eric.auger@redhat.com> | 2019-11-26 18:54:13 +0100 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2019-12-16 08:58:42 -0800 |
| commit | 4c80ba392bf603d468ea827d902f8e7b2505fbf4 (patch) | |
| tree | 1c1e5bc6a0ac7fa9d5ff86da7330d0860aaaf9af /drivers | |
| parent | 7de7de7ca0ae0fc70515ee3154af33af75edae2c (diff) | |
iommu: fix KASAN use-after-free in iommu_insert_resv_region
In case the new region gets merged into another one, the nr list node is
freed. Checking its type while completing the merge algorithm leads to
a use-after-free. Use new->type instead.
Fixes: 4dbd258ff63e ("iommu: Revisit iommu_insert_resv_region() implementation")
Signed-off-by: Eric Auger <eric.auger@redhat.com>
Reported-by: Qian Cai <cai@lca.pw>
Reviewed-by: Jerry Snitselaar <jsnitsel@redhat.com>
Cc: Stable <stable@vger.kernel.org> #v5.3+
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/iommu/iommu.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c index db7bfd4f2d20..1c3f2a3035c1 100644 --- a/drivers/iommu/iommu.c +++ b/drivers/iommu/iommu.c @@ -312,8 +312,8 @@ int iommu_insert_resv_region(struct iommu_resv_region *new, list_for_each_entry_safe(iter, tmp, regions, list) { phys_addr_t top_end, iter_end = iter->start + iter->length - 1; - /* no merge needed on elements of different types than @nr */ - if (iter->type != nr->type) { + /* no merge needed on elements of different types than @new */ + if (iter->type != new->type) { list_move_tail(&iter->list, &stack); continue; } |