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-rw-r--r--lib/stackdepot.c15
1 files changed, 13 insertions, 2 deletions
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 81c69c08d1d1..1ec36ee344e0 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -202,9 +202,20 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle,
unsigned long **entries)
{
union handle_parts parts = { .handle = handle };
- void *slab = stack_slabs[parts.slabindex];
+ void *slab;
size_t offset = parts.offset << STACK_ALLOC_ALIGN;
- struct stack_record *stack = slab + offset;
+ struct stack_record *stack;
+
+ *entries = NULL;
+ if (parts.slabindex > depot_index) {
+ WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n",
+ parts.slabindex, depot_index, handle);
+ return 0;
+ }
+ slab = stack_slabs[parts.slabindex];
+ if (!slab)
+ return 0;
+ stack = slab + offset;
*entries = stack->entries;
return stack->size;