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Date: Tue, 6 Aug 2013 08:26:43 +0200
From: Richard Weinberger <richard@....at>
To: linux-mtd@...ts.infradead.org
Cc: dedekind1@...il.com, dwmw2@...radead.org,
linux-kernel@...r.kernel.org, Thomas Weber <thomas@...weber.eu>,
wang bo <wang.bo116@....com.cn>,
Richard Weinberger <richard@....at>
Subject: [PATCH] UBI: Fastmap: Fix memory leak
From: Thomas Weber <thomas@...weber.eu>
Tested with linux-v3.10-rc3 on Devkit8000.
The discussion about this patch can be found:
https://lkml.org/lkml/2013/5/2/118
This patches fixes the following bug for me:
When CONFIG_DEBUG_VM is active and making
ubiattach ... ; ubidetach...; ubiattach ...
the second ubiattach stops with:
[ 37.918304] UBI: default fastmap pool size: 95
[ 37.923004] UBI: default fastmap WL pool size: 25
[ 37.928741] UBI: attaching mtd4 to ubi0
[ 37.933197] kmem_cache_sanity_check (ubi_aeb_slab_cache): Cache name already exists.
[ 37.941864] CPU: 0 PID: 757 Comm: ubiattach Not tainted 3.10.0-rc3 #66
[ 37.949066] [<c0013d90>] (unwind_backtrace+0x0/0xec) from [<c0011660>] (show_stack+0x20/0x24)
[ 37.958343] [<c0011660>] (show_stack+0x20/0x24) from [<c041527c>] (dump_stack+0x20/0x28)
[ 37.967163] [<c041527c>] (dump_stack+0x20/0x28) from [<c00d70b4>] (kmem_cache_create_memcg+0x120/0x2a4)
[ 37.977478] [<c00d70b4>] (kmem_cache_create_memcg+0x120/0x2a4) from [<c00d7280>] (kmem_cache_create+0x48/0x50)
[ 37.988281] [<c00d7280>] (kmem_cache_create+0x48/0x50) from [<c02fa090>] (alloc_ai+0x84/0xb0)
[ 37.997528] [<c02fa090>] (alloc_ai+0x84/0xb0) from [<c02fbde4>] (ubi_attach+0x28/0x34c)
[ 38.006225] [<c02fbde4>] (ubi_attach+0x28/0x34c) from [<c02f07c8>] (ubi_attach_mtd_dev+0x69c/0xca4)
[ 38.016021] [<c02f07c8>] (ubi_attach_mtd_dev+0x69c/0xca4) from [<c02f1078>] (ctrl_cdev_ioctl+0xe4/0x190)
[ 38.026275] [<c02f1078>] (ctrl_cdev_ioctl+0xe4/0x190) from [<c00fee00>] (do_vfs_ioctl+0x554/0x5c4)
[ 38.035980] [<c00fee00>] (do_vfs_ioctl+0x554/0x5c4) from [<c00feebc>] (SyS_ioctl+0x4c/0x6c)
[ 38.045043] [<c00feebc>] (SyS_ioctl+0x4c/0x6c) from [<c000dca0>] (ret_fast_syscall+0x0/0x48)
[ 38.054168] UBI error: ubi_attach_mtd_dev: failed to attach mtd4, error -12
ubiattach: error!: cannot attach "/dev/mtd4"
error 12 (Cannot allocate memory)
Signed-off-by: wang bo <wang.bo116@....com.cn>
Signed-off-by: Thomas Weber <thomas@...weber.eu>
[Thomas: fix whitespace errors]
Signed-off-by: Richard Weinberger <richard@....at>
diff --git a/drivers/mtd/ubi/attach.c b/drivers/mtd/ubi/attach.c
index c071d41..e9f64bc 100644
--- a/drivers/mtd/ubi/attach.c
+++ b/drivers/mtd/ubi/attach.c
@@ -1212,6 +1212,30 @@ static void destroy_ai(struct ubi_attach_info *ai)
kfree(ai);
}
+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;
+}
+
/**
* scan_all - scan entire MTD device.
* @ubi: UBI device description object
@@ -1315,8 +1339,13 @@ 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;
+ struct ubi_attach_info *fm_temp_ai = NULL;
err = -ENOMEM;
+ fm_temp_ai = alloc_ai("ubi_scan_fastmap_slab_cache");
+ if (!fm_temp_ai)
+ goto out;
+
ech = kzalloc(ubi->ec_hdr_alsize, GFP_KERNEL);
if (!ech)
goto out;
@@ -1331,7 +1360,7 @@ 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, fm_temp_ai, pnum, &vol_id, &sqnum);
if (err < 0)
goto out_vidh;
@@ -1343,6 +1372,7 @@ static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai)
ubi_free_vid_hdr(ubi, vidh);
kfree(ech);
+ destroy_ai(fm_temp_ai);
if (fm_anchor < 0)
return UBI_NO_FASTMAP;
@@ -1351,6 +1381,7 @@ static int scan_fast(struct ubi_device *ubi, struct ubi_attach_info *ai)
out_vidh:
ubi_free_vid_hdr(ubi, vidh);
+ destroy_ai(fm_temp_ai);
out_ech:
kfree(ech);
out:
@@ -1359,29 +1390,6 @@ 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.
@@ -1419,7 +1427,7 @@ int ubi_attach(struct ubi_device *ubi, int force_scan)
return -ENOMEM;
}
- err = scan_all(ubi, ai, UBI_FM_MAX_START);
+ err = scan_all(ubi, ai, 0);
}
}
#else
diff --git a/drivers/mtd/ubi/fastmap.c b/drivers/mtd/ubi/fastmap.c
index 1542751..6935f0c 100644
--- a/drivers/mtd/ubi/fastmap.c
+++ b/drivers/mtd/ubi/fastmap.c
@@ -552,21 +552,8 @@ 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);
--
1.8.3.1
--
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