slub: fix/clean free_debug_processing return paths
Since commit 19c7ff9ecd
("slub: Take node lock during object free
checks") check_object has been incorrectly returning success as it
follows the out label which just returns the node.
Thanks to refactoring, the out and fail paths are now basically the
same. Combine the two into one and just use a single label.
Credit to Mathias Krause for the original work which inspired this
series
Signed-off-by: Laura Abbott <labbott@fedoraproject.org>
Acked-by: Christoph Lameter <cl@linux.com>
Cc: Pekka Enberg <penberg@kernel.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Joonsoo Kim <js1304@gmail.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Mathias Krause <minipli@googlemail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
parent
282acb4361
commit
804aa132d3
21
mm/slub.c
21
mm/slub.c
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@ -1053,24 +1053,25 @@ static noinline int free_debug_processing(
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void *object = head;
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void *object = head;
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int cnt = 0;
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int cnt = 0;
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unsigned long uninitialized_var(flags);
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unsigned long uninitialized_var(flags);
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int ret = 0;
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spin_lock_irqsave(&n->list_lock, flags);
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spin_lock_irqsave(&n->list_lock, flags);
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slab_lock(page);
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slab_lock(page);
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if (!check_slab(s, page))
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if (!check_slab(s, page))
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goto fail;
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goto out;
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next_object:
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next_object:
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cnt++;
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cnt++;
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if (!check_valid_pointer(s, page, object)) {
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if (!check_valid_pointer(s, page, object)) {
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slab_err(s, page, "Invalid object pointer 0x%p", object);
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slab_err(s, page, "Invalid object pointer 0x%p", object);
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goto fail;
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goto out;
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}
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}
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if (on_freelist(s, page, object)) {
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if (on_freelist(s, page, object)) {
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object_err(s, page, object, "Object already free");
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object_err(s, page, object, "Object already free");
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goto fail;
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goto out;
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}
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}
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if (!check_object(s, page, object, SLUB_RED_ACTIVE))
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if (!check_object(s, page, object, SLUB_RED_ACTIVE))
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@ -1087,7 +1088,7 @@ next_object:
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} else
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} else
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object_err(s, page, object,
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object_err(s, page, object,
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"page slab pointer corrupt.");
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"page slab pointer corrupt.");
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goto fail;
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goto out;
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}
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}
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if (s->flags & SLAB_STORE_USER)
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if (s->flags & SLAB_STORE_USER)
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@ -1101,6 +1102,8 @@ next_object:
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object = get_freepointer(s, object);
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object = get_freepointer(s, object);
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goto next_object;
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goto next_object;
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}
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}
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ret = 1;
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out:
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out:
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if (cnt != bulk_cnt)
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if (cnt != bulk_cnt)
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slab_err(s, page, "Bulk freelist count(%d) invalid(%d)\n",
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slab_err(s, page, "Bulk freelist count(%d) invalid(%d)\n",
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@ -1108,13 +1111,9 @@ out:
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slab_unlock(page);
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slab_unlock(page);
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spin_unlock_irqrestore(&n->list_lock, flags);
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spin_unlock_irqrestore(&n->list_lock, flags);
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return 1;
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if (!ret)
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slab_fix(s, "Object at 0x%p not freed", object);
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fail:
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return ret;
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slab_unlock(page);
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spin_unlock_irqrestore(&n->list_lock, flags);
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slab_fix(s, "Object at 0x%p not freed", object);
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return 0;
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}
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}
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static int __init setup_slub_debug(char *str)
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static int __init setup_slub_debug(char *str)
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