We should check for a NULL pointer first before adding the offset.
Otherwise if the pointer is NULL and the offset is non-zero, it will
lead to an Oops.
Fixes: d45048e65a59 ("lib/stackdepot.c: check depot_index before accessing the stack slab")
Signed-off-by: Dan Carpenter <dan.carpenter@xxxxxxxxxx>
---
lib/stackdepot.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index da5d1880bf34..2caffc64e4c8 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -207,18 +207,16 @@ unsigned int stack_depot_fetch(depot_stack_handle_t handle,
size_t offset = parts.offset << STACK_ALLOC_ALIGN;
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);
- *entries = NULL;
return 0;
}
slab = stack_slabs[parts.slabindex];
- stack = slab + offset;
- if (!stack) {
- *entries = NULL;
+ if (!slab)
return 0;
- }
+ stack = slab + offset;
*entries = stack->entries;
return stack->size;
--
2.20.1
