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Subject[PATCH 6/6] UBI: Fastmap: Fix memory leak while attaching
Date
Currently we leak a few ubi_ainf_pebs while attaching.

Signed-off-by: Richard Weinberger <richard@nod.at>
---
drivers/mtd/ubi/attach.c | 61 +++++++++++++++++++++++++----------------------
drivers/mtd/ubi/fastmap.c | 13 ----------
2 files changed, 33 insertions(+), 41 deletions(-)

diff --git a/drivers/mtd/ubi/attach.c b/drivers/mtd/ubi/attach.c
index 9d2e16f..32cad5c 100644
--- a/drivers/mtd/ubi/attach.c
+++ b/drivers/mtd/ubi/attach.c
@@ -1301,6 +1301,30 @@ out_ech:
return err;
}

+static struct ubi_attach_info *alloc_ai(const char *slab_name)
+{
+ struct ubi_attach_info *ai;
+
+ ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL);
+ if (!ai)
+ return ai;
+
+ INIT_LIST_HEAD(&ai->corr);
+ INIT_LIST_HEAD(&ai->free);
+ INIT_LIST_HEAD(&ai->erase);
+ INIT_LIST_HEAD(&ai->alien);
+ ai->volumes = RB_ROOT;
+ ai->aeb_slab_cache = kmem_cache_create(slab_name,
+ sizeof(struct ubi_ainf_peb),
+ 0, 0, NULL);
+ if (!ai->aeb_slab_cache) {
+ kfree(ai);
+ ai = NULL;
+ }
+
+ return ai;
+}
+
#ifdef CONFIG_MTD_UBI_FASTMAP

/**
@@ -1313,7 +1337,7 @@ out_ech:
* UBI_NO_FASTMAP denotes that no fastmap was found.
* UBI_BAD_FASTMAP denotes that the found fastmap was invalid.
*/
-static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai)
+static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info **ai)
{
int err, pnum, fm_anchor = -1;
unsigned long long max_sqnum = 0;
@@ -1334,7 +1358,7 @@ static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai)
cond_resched();

dbg_gen("process PEB %d", pnum);
- err = scan_peb(ubi, ai, pnum, &vol_id, &sqnum);
+ err = scan_peb(ubi, *ai, pnum, &vol_id, &sqnum);
if (err < 0)
goto out_vidh;

@@ -1350,7 +1374,12 @@ static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai)
if (fm_anchor < 0)
return UBI_NO_FASTMAP;

- return ubi_scan_fastmap(ubi, ai, fm_anchor);
+ destroy_ai(*ai);
+ *ai = alloc_ai("ubi_aeb_slab_cache");
+ if (!*ai)
+ return -ENOMEM;
+
+ return ubi_scan_fastmap(ubi, *ai, fm_anchor);

out_vidh:
ubi_free_vid_hdr(ubi, vidh);
@@ -1362,30 +1391,6 @@ out:

#endif

-static struct ubi_attach_info *alloc_ai(const char *slab_name)
-{
- struct ubi_attach_info *ai;
-
- ai = kzalloc(sizeof(struct ubi_attach_info), GFP_KERNEL);
- if (!ai)
- return ai;
-
- INIT_LIST_HEAD(&ai->corr);
- INIT_LIST_HEAD(&ai->free);
- INIT_LIST_HEAD(&ai->erase);
- INIT_LIST_HEAD(&ai->alien);
- ai->volumes = RB_ROOT;
- ai->aeb_slab_cache = kmem_cache_create(slab_name,
- sizeof(struct ubi_ainf_peb),
- 0, 0, NULL);
- if (!ai->aeb_slab_cache) {
- kfree(ai);
- ai = NULL;
- }
-
- return ai;
-}
-
/**
* ubi_attach - attach an MTD device.
* @ubi: UBI device descriptor
@@ -1413,7 +1418,7 @@ int ubi_attach(struct ubi_device *ubi, int force_scan)
if (force_scan)
err = scan_all(ubi, ai, 0);
else {
- err = scan_fast(ubi, ai);
+ err = scan_fast(ubi, &ai);
if (err > 0) {
if (err != UBI_NO_FASTMAP) {
destroy_ai(ai);
diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 9507702..600c4f9 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -561,21 +561,8 @@ static int ubi_attach_fastmap(struct ubi_device *ubi,
INIT_LIST_HEAD(&used);
INIT_LIST_HEAD(&free);
INIT_LIST_HEAD(&eba_orphans);
- INIT_LIST_HEAD(&ai->corr);
- INIT_LIST_HEAD(&ai->free);
- INIT_LIST_HEAD(&ai->erase);
- INIT_LIST_HEAD(&ai->alien);
- ai->volumes = RB_ROOT;
ai->min_ec = UBI_MAX_ERASECOUNTER;

- ai->aeb_slab_cache = kmem_cache_create("ubi_ainf_peb_slab",
- sizeof(struct ubi_ainf_peb),
- 0, 0, NULL);
- if (!ai->aeb_slab_cache) {
- ret = -ENOMEM;
- goto fail;
- }
-
fmsb = (struct ubi_fm_sb *)(fm_raw);
ai->max_sqnum = fmsb->sqnum;
fm_pos += sizeof(struct ubi_fm_sb);
--
1.8.4.5


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