Bug 85031
| Summary: | Uninitialized use of ralign variable in __kmem_cache_create from mm/slab.c. | ||
|---|---|---|---|
| Product: | Memory Management | Reporter: | Andrei Elovikov (a.elovikov) |
| Component: | Slab Allocator | Assignee: | Andrew Morton (akpm) |
| Status: | RESOLVED PATCH_ALREADY_AVAILABLE | ||
| Severity: | normal | CC: | alan |
| Priority: | P1 | ||
| Hardware: | Intel | ||
| OS: | Linux | ||
| Kernel Version: | Found using 3.15, still presents in 3.17 | Subsystem: | |
| Regression: | No | Bisected commit-id: | |
Current kernel has ralign = BYTES_PER_WORD already |
Found when compiled the kernel with Intel Compiler. If the value is initialized with zero the issue goes away: diff --git a/mm/slab.c b/mm/slab.c index 19d9218..08e0f70 100644 --- a/mm/slab.c +++ b/mm/slab.c @@ -2160,7 +2160,7 @@ static int __init_refok setup_cpu_cache(struct kmem_cache *cachep, gfp_t gfp) int __kmem_cache_create (struct kmem_cache *cachep, unsigned long flags) { - size_t left_over, freelist_size, ralign; + size_t left_over, freelist_size, ralign = 0; gfp_t gfp; int err; size_t size = cachep->size;