[117/166] lib/stackdepot.c: check depot_index before accessing the stack slab

Commit Message

Andrew Morton April 7, 2020, 3:10 a.m. UTC

From: Alexander Potapenko <[e-mail]>
Subject: lib/stackdepot.c: check depot_index before accessing the stack slab

Avoid crashes on corrupted stack ids.  Despite stack ID corruption may
indicate other bugs in the program, we'd better fail gracefully on such
IDs instead of crashing the kernel.

This patch has been previously mailed as part of KMSAN RFC patch series.

Link: http://lkml.kernel.org/r/[e-mail]
Signed-off-by: Alexander Potapenko <[e-mail]>
Cc: Vegard Nossum <[e-mail]>
Cc: Dmitry Vyukov <[e-mail]>
Cc: Marco Elver <[e-mail]>
Cc: Andrey Konovalov <[e-mail]>
Cc: Andrey Ryabinin <[e-mail]>
Cc: Arnd Bergmann <[e-mail]>
Cc: Sergey Senozhatsky <[e-mail]>
From: Dan Carpenter <[e-mail]>
Subject: lib/stackdepot.c: fix a condition in stack_depot_fetch()

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.

Link: http://lkml.kernel.org/r/20200312113006.GA20562@mwanda
Fixes: d45048e65a59 ("lib/stackdepot.c: check depot_index before accessing the stack slab")
Signed-off-by: Dan Carpenter <[e-mail]>
Acked-by: Alexander Potapenko <[e-mail]>
Signed-off-by: Andrew Morton <[e-mail]>
---

 lib/stackdepot.c |   15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

Patch

--- a/lib/stackdepot.c~stackdepot-check-depot_index-before-accessing-the-stack-slab
+++ a/lib/stackdepot.c
@@ -202,9 +202,20 @@  unsigned int stack_depot_fetch(depot_sta
 			       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;