[RESEND,1/3] lib, stackdepot: check stackdepot handle before accessing slabs.

Commit Message

Imran Khan Sept. 15, 2021, 1:48 a.m. UTC

stack_depot_save allocates slabs that will be used for storing
objects in future.If this slab allocation fails we may get to
a situation where space allocation for a new stack_record fails,
causing stack_depot_save to return 0 as handle.
If user of this handle ends up invoking stack_depot_fetch with
this handle value, current implementation of stack_depot_fetch
will end up using slab from wrong index.
To avoid this check handle value at the beginning.

Signed-off-by: Imran Khan <[e-mail]>
Suggested-by: Vlastimil Babka <[e-mail]>

Acked-by: Vlastimil Babka <[e-mail]>
---
 lib/stackdepot.c | 3 +++
 1 file changed, 3 insertions(+)

Patch

diff --git a/lib/stackdepot.c b/lib/stackdepot.c
index 0a2e417f83cb..67439c082490 100644
--- a/lib/stackdepot.c
+++ b/lib/stackdepot.c
@@ -232,6 +232,9 @@  unsigned int stack_depot_fetch(depot_stack_handle_t handle,
 	struct stack_record *stack;
 
 	*entries = NULL;
+	if (!handle)
+		return 0;
+
 	if (parts.slabindex > depot_index) {
 		WARN(1, "slab index %d out of bounds (%d) for stack id %08x\n",
 			parts.slabindex, depot_index, handle);