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authorUladzislau Rezki (Sony) <urezki@gmail.com>2020-08-06 23:24:24 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2020-08-07 11:33:28 -0700
commit9c801f61d0e9e19b685ceb6e5f7107ad29b7837e (patch)
treec702eba12cfbc5261e9c6813a5f2647741b353a2 /mm/vmalloc.c
parent1a69a623d98397e3968a3bd6e9f650e8a5e8fdce (diff)
mm/vmalloc.c: remove BUG() from the find_va_links()
Get rid of BUG() macro, that should be used only when a critical situation happens and a system is not able to function anymore. Replace it with WARN() macro instead, dump some extra information about start/end addresses of both VAs which overlap. Such overlap data can help to figure out what happened making further analysis easier. For example if both areas are identical it could mean a double free. A recovery process consists of declining all further steps regarding inserting of conflicting overlap range. In that sense find_va_links() now can return NULL, so its return value has to be checked by callers. Side effect of such process is it can leak memory, but it is better than just killing a machine for no good reason. Apart of that a debugging process can be done on alive system. Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Cc: Hillf Danton <hdanton@sina.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/20200711104531.12242-1-urezki@gmail.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c41
1 files changed, 32 insertions, 9 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 3d7b94eb0ac0..b482d240f9a2 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -512,6 +512,10 @@ static struct vmap_area *__find_vmap_area(unsigned long addr)
/*
* This function returns back addresses of parent node
* and its left or right link for further processing.
+ *
+ * Otherwise NULL is returned. In that case all further
+ * steps regarding inserting of conflicting overlap range
+ * have to be declined and actually considered as a bug.
*/
static __always_inline struct rb_node **
find_va_links(struct vmap_area *va,
@@ -550,8 +554,12 @@ find_va_links(struct vmap_area *va,
else if (va->va_end > tmp_va->va_start &&
va->va_start >= tmp_va->va_end)
link = &(*link)->rb_right;
- else
- BUG();
+ else {
+ WARN(1, "vmalloc bug: 0x%lx-0x%lx overlaps with 0x%lx-0x%lx\n",
+ va->va_start, va->va_end, tmp_va->va_start, tmp_va->va_end);
+
+ return NULL;
+ }
} while (*link);
*parent = &tmp_va->rb_node;
@@ -697,7 +705,8 @@ insert_vmap_area(struct vmap_area *va,
struct rb_node *parent;
link = find_va_links(va, root, NULL, &parent);
- link_va(va, root, parent, link, head);
+ if (link)
+ link_va(va, root, parent, link, head);
}
static void
@@ -713,8 +722,10 @@ insert_vmap_area_augment(struct vmap_area *va,
else
link = find_va_links(va, root, NULL, &parent);
- link_va(va, root, parent, link, head);
- augment_tree_propagate_from(va);
+ if (link) {
+ link_va(va, root, parent, link, head);
+ augment_tree_propagate_from(va);
+ }
}
/*
@@ -722,6 +733,11 @@ insert_vmap_area_augment(struct vmap_area *va,
* and next free blocks. If coalesce is not done a new
* free area is inserted. If VA has been merged, it is
* freed.
+ *
+ * Please note, it can return NULL in case of overlap
+ * ranges, followed by WARN() report. Despite it is a
+ * buggy behaviour, a system can be alive and keep
+ * ongoing.
*/
static __always_inline struct vmap_area *
merge_or_add_vmap_area(struct vmap_area *va,
@@ -738,6 +754,8 @@ merge_or_add_vmap_area(struct vmap_area *va,
* inserted, unless it is merged with its sibling/siblings.
*/
link = find_va_links(va, root, NULL, &parent);
+ if (!link)
+ return NULL;
/*
* Get next node of VA to check if merging can be done.
@@ -1346,6 +1364,9 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
va = merge_or_add_vmap_area(va, &free_vmap_area_root,
&free_vmap_area_list);
+ if (!va)
+ continue;
+
if (is_vmalloc_or_module_addr((void *)orig_start))
kasan_release_vmalloc(orig_start, orig_end,
va->va_start, va->va_end);
@@ -3330,8 +3351,9 @@ recovery:
orig_end = vas[area]->va_end;
va = merge_or_add_vmap_area(vas[area], &free_vmap_area_root,
&free_vmap_area_list);
- kasan_release_vmalloc(orig_start, orig_end,
- va->va_start, va->va_end);
+ if (va)
+ kasan_release_vmalloc(orig_start, orig_end,
+ va->va_start, va->va_end);
vas[area] = NULL;
}
@@ -3379,8 +3401,9 @@ err_free_shadow:
orig_end = vas[area]->va_end;
va = merge_or_add_vmap_area(vas[area], &free_vmap_area_root,
&free_vmap_area_list);
- kasan_release_vmalloc(orig_start, orig_end,
- va->va_start, va->va_end);
+ if (va)
+ kasan_release_vmalloc(orig_start, orig_end,
+ va->va_start, va->va_end);
vas[area] = NULL;
kfree(vms[area]);
}