* [PATCH] udf: fix potential refcnt problem of nls module
@ 2018-02-25 13:25 Chengguang Xu
2018-02-28 12:36 ` Jan Kara
0 siblings, 1 reply; 2+ messages in thread
From: Chengguang Xu @ 2018-02-25 13:25 UTC (permalink / raw)
To: jack; +Cc: linux-kernel, Chengguang Xu
When specifiying iocharset multiple times in a mount
or once/multiple in a remount, current option parsing
may cause inaccurate refcount of nls module.
Also, in the failure cleanup of option parsing,
the condition of calling unload_nls is not sufficient.
Signed-off-by: Chengguang Xu <cgxu519@icloud.com>
---
Hi Jan,
I found this issue by checking code so now post the fix for rewiew,
but sorry I did't get enough resource to fully test it, I can only
make sure the fix can successfuly comiple with no error.
fs/udf/super.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
diff --git a/fs/udf/super.c b/fs/udf/super.c
index 7b27b06..7e73a98 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -523,8 +523,12 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
break;
#ifdef CONFIG_UDF_NLS
case Opt_iocharset:
- uopt->nls_map = load_nls(args[0].from);
- uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
+ if (!remount) {
+ if (uopt->nls_map)
+ unload_nls(uopt->nls_map);
+ uopt->nls_map = load_nls(args[0].from);
+ uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
+ }
break;
#endif
case Opt_uignore:
@@ -2082,8 +2086,8 @@ error_out:
for (i = 0; i < sbi->s_partitions; i++)
udf_free_partition(&sbi->s_partmaps[i]);
#ifdef CONFIG_UDF_NLS
- if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
- unload_nls(sbi->s_nls_map);
+ if (uopt.nls_map)
+ unload_nls(uopt.nls_map);
#endif
if (!(sb->s_flags & MS_RDONLY))
udf_close_lvid(sb);
--
1.8.3.1
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] udf: fix potential refcnt problem of nls module
2018-02-25 13:25 [PATCH] udf: fix potential refcnt problem of nls module Chengguang Xu
@ 2018-02-28 12:36 ` Jan Kara
0 siblings, 0 replies; 2+ messages in thread
From: Jan Kara @ 2018-02-28 12:36 UTC (permalink / raw)
To: Chengguang Xu; +Cc: jack, linux-kernel
On Sun 25-02-18 21:25:07, Chengguang Xu wrote:
> When specifiying iocharset multiple times in a mount
> or once/multiple in a remount, current option parsing
> may cause inaccurate refcount of nls module.
> Also, in the failure cleanup of option parsing,
> the condition of calling unload_nls is not sufficient.
>
> Signed-off-by: Chengguang Xu <cgxu519@icloud.com>
> ---
>
> Hi Jan,
>
> I found this issue by checking code so now post the fix for rewiew,
> but sorry I did't get enough resource to fully test it, I can only
> make sure the fix can successfuly comiple with no error.
Thanks for the patch. I have added it to my tree.
Honza
>
> fs/udf/super.c | 12 ++++++++----
> 1 file changed, 8 insertions(+), 4 deletions(-)
>
> diff --git a/fs/udf/super.c b/fs/udf/super.c
> index 7b27b06..7e73a98 100644
> --- a/fs/udf/super.c
> +++ b/fs/udf/super.c
> @@ -523,8 +523,12 @@ static int udf_parse_options(char *options, struct udf_options *uopt,
> break;
> #ifdef CONFIG_UDF_NLS
> case Opt_iocharset:
> - uopt->nls_map = load_nls(args[0].from);
> - uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
> + if (!remount) {
> + if (uopt->nls_map)
> + unload_nls(uopt->nls_map);
> + uopt->nls_map = load_nls(args[0].from);
> + uopt->flags |= (1 << UDF_FLAG_NLS_MAP);
> + }
> break;
> #endif
> case Opt_uignore:
> @@ -2082,8 +2086,8 @@ error_out:
> for (i = 0; i < sbi->s_partitions; i++)
> udf_free_partition(&sbi->s_partmaps[i]);
> #ifdef CONFIG_UDF_NLS
> - if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP))
> - unload_nls(sbi->s_nls_map);
> + if (uopt.nls_map)
> + unload_nls(uopt.nls_map);
> #endif
> if (!(sb->s_flags & MS_RDONLY))
> udf_close_lvid(sb);
> --
> 1.8.3.1
>
--
Jan Kara <jack@suse.com>
SUSE Labs, CR
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