From: David Howells <dhowells@redhat.com>
To: trond.myklebust@hammerspace.com, anna.schumaker@netapp.com
Cc: Al Viro <viro@zeniv.linux.org.uk>,
dhowells@redhat.com, viro@zeniv.linux.org.uk,
linux-nfs@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH 21/23] NFS: Add a small buffer in nfs_fs_context to avoid string dup
Date: Thu, 23 May 2019 17:18:50 +0100 [thread overview]
Message-ID: <155862832993.26654.13644247168126569903.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <155862813755.26654.563679411147031501.stgit@warthog.procyon.org.uk>
Add a small buffer in nfs_fs_context to avoid string duplication when
parsing numbers. Also make the parsing function wrapper place the parsed
integer directly in the appropriate nfs_fs_context struct member.
Signed-off-by: David Howells <dhowells@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---
fs/nfs/fs_context.c | 82 +++++++++++++++++++--------------------------------
fs/nfs/internal.h | 2 +
2 files changed, 32 insertions(+), 52 deletions(-)
diff --git a/fs/nfs/fs_context.c b/fs/nfs/fs_context.c
index c7796fb76732..5ba534127c0b 100644
--- a/fs/nfs/fs_context.c
+++ b/fs/nfs/fs_context.c
@@ -467,27 +467,22 @@ static int nfs_get_option_str(substring_t args[], char **option)
return !*option;
}
-static int nfs_get_option_ul(substring_t args[], unsigned long *option)
+static int nfs_get_option_ui(struct nfs_fs_context *ctx,
+ substring_t args[], unsigned int *option)
{
- int rc;
- char *string;
-
- string = match_strdup(args);
- if (string == NULL)
- return -ENOMEM;
- rc = kstrtoul(string, 10, option);
- kfree(string);
-
- return rc;
+ match_strlcpy(ctx->buf, args, sizeof(ctx->buf));
+ return kstrtouint(ctx->buf, 10, option);
}
-static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
- unsigned long l_bound, unsigned long u_bound)
+static int nfs_get_option_ui_bound(struct nfs_fs_context *ctx,
+ substring_t args[], unsigned int *option,
+ unsigned int l_bound, unsigned u_bound)
{
int ret;
- ret = nfs_get_option_ul(args, option);
- if (ret != 0)
+ match_strlcpy(ctx->buf, args, sizeof(ctx->buf));
+ ret = kstrtouint(ctx->buf, 10, option);
+ if (ret < 0)
return ret;
if (*option < l_bound || *option > u_bound)
return -ERANGE;
@@ -500,7 +495,6 @@ static int nfs_get_option_ul_bound(substring_t args[], unsigned long *option,
static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
{
substring_t args[MAX_OPT_ARGS];
- unsigned long option;
char *string;
int token, rc;
@@ -608,86 +602,70 @@ static int nfs_fs_context_parse_option(struct nfs_fs_context *ctx, char *p)
* options that take numeric values
*/
case Opt_port:
- if (nfs_get_option_ul(args, &option) ||
- option > USHRT_MAX)
+ if (nfs_get_option_ui_bound(ctx, args, &ctx->nfs_server.port,
+ 0, USHRT_MAX))
goto out_invalid_value;
- ctx->nfs_server.port = option;
break;
case Opt_rsize:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->rsize))
goto out_invalid_value;
- ctx->rsize = option;
break;
case Opt_wsize:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->wsize))
goto out_invalid_value;
- ctx->wsize = option;
break;
case Opt_bsize:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->bsize))
goto out_invalid_value;
- ctx->bsize = option;
break;
case Opt_timeo:
- if (nfs_get_option_ul_bound(args, &option, 1, INT_MAX))
+ if (nfs_get_option_ui_bound(ctx, args, &ctx->timeo, 1, INT_MAX))
goto out_invalid_value;
- ctx->timeo = option;
break;
case Opt_retrans:
- if (nfs_get_option_ul_bound(args, &option, 0, INT_MAX))
+ if (nfs_get_option_ui_bound(ctx, args, &ctx->retrans, 0, INT_MAX))
goto out_invalid_value;
- ctx->retrans = option;
break;
case Opt_acregmin:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->acregmin))
goto out_invalid_value;
- ctx->acregmin = option;
break;
case Opt_acregmax:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->acregmax))
goto out_invalid_value;
- ctx->acregmax = option;
break;
case Opt_acdirmin:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->acdirmin))
goto out_invalid_value;
- ctx->acdirmin = option;
break;
case Opt_acdirmax:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->acdirmax))
goto out_invalid_value;
- ctx->acdirmax = option;
break;
case Opt_actimeo:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->acdirmax))
goto out_invalid_value;
ctx->acregmin = ctx->acregmax =
- ctx->acdirmin = ctx->acdirmax = option;
+ ctx->acdirmin = ctx->acdirmax;
break;
case Opt_namelen:
- if (nfs_get_option_ul(args, &option))
+ if (nfs_get_option_ui(ctx, args, &ctx->namlen))
goto out_invalid_value;
- ctx->namlen = option;
break;
case Opt_mountport:
- if (nfs_get_option_ul(args, &option) ||
- option > USHRT_MAX)
+ if (nfs_get_option_ui_bound(ctx, args, &ctx->mount_server.port,
+ 0, USHRT_MAX))
goto out_invalid_value;
- ctx->mount_server.port = option;
break;
case Opt_mountvers:
- if (nfs_get_option_ul(args, &option) ||
- option < NFS_MNT_VERSION ||
- option > NFS_MNT3_VERSION)
+ if (nfs_get_option_ui_bound(ctx, args, &ctx->mount_server.version,
+ NFS_MNT_VERSION, NFS_MNT3_VERSION))
goto out_invalid_value;
- ctx->mount_server.version = option;
break;
case Opt_minorversion:
- if (nfs_get_option_ul(args, &option))
- goto out_invalid_value;
- if (option > NFS4_MAX_MINOR_VERSION)
+ if (nfs_get_option_ui_bound(ctx, args, &ctx->minorversion,
+ 0, NFS4_MAX_MINOR_VERSION))
goto out_invalid_value;
- ctx->minorversion = option;
break;
/*
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index c4a1203163ba..6efdbedeeee8 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -129,6 +129,8 @@ struct nfs_fs_context {
void *lsm_opts;
struct net *net;
+
+ char buf[32]; /* Parse buffer */
};
/* mount_clnt.c */
next prev parent reply other threads:[~2019-05-23 16:18 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-23 16:15 [PATCH 00/23] nfs: Mount API conversion David Howells
2019-05-23 16:15 ` [PATCH 01/23] saner calling conventions for nfs_fs_mount_common() David Howells
2019-05-23 16:16 ` [PATCH 02/23] nfs: stash server into struct nfs_mount_info David Howells
2019-05-23 16:16 ` [PATCH 03/23] nfs: lift setting mount_info from nfs4_remote{, _referral}_mount David Howells
2019-05-23 16:16 ` [PATCH 04/23] nfs: fold nfs4_remote_fs_type and nfs4_remote_referral_fs_type David Howells
2019-05-23 16:16 ` [PATCH 05/23] nfs: don't bother setting/restoring export_path around do_nfs_root_mount() David Howells
2019-05-23 16:16 ` [PATCH 06/23] nfs4: fold nfs_do_root_mount/nfs_follow_remote_path David Howells
2019-05-23 16:16 ` [PATCH 07/23] nfs: lift setting mount_info from nfs_xdev_mount() David Howells
2019-05-23 16:17 ` [PATCH 08/23] nfs: stash nfs_subversion reference into nfs_mount_info David Howells
2019-05-23 16:17 ` [PATCH 09/23] nfs: don't bother passing nfs_subversion to ->try_mount() and nfs_fs_mount_common() David Howells
2019-05-23 16:17 ` [PATCH 10/23] nfs: merge xdev and remote file_system_type David Howells
2019-05-23 16:17 ` [PATCH 11/23] nfs: unexport nfs_fs_mount_common() David Howells
2019-05-23 16:17 ` [PATCH 12/23] nfs: don't pass nfs_subversion to ->create_server() David Howells
2019-05-23 16:17 ` [PATCH 13/23] nfs: get rid of mount_info ->fill_super() David Howells
2019-05-23 16:17 ` [PATCH 14/23] nfs_clone_sb_security(): simplify the check for server bogosity David Howells
2019-05-23 16:18 ` [PATCH 15/23] nfs: get rid of ->set_security() David Howells
2019-05-23 16:18 ` [PATCH 16/23] NFS: Move mount parameterisation bits into their own file David Howells
2019-05-23 16:18 ` [PATCH 17/23] NFS: Constify mount argument match tables David Howells
2019-05-23 16:18 ` [PATCH 18/23] NFS: Rename struct nfs_parsed_mount_data to struct nfs_fs_context David Howells
2019-05-23 16:18 ` [PATCH 19/23] NFS: Split nfs_parse_mount_options() David Howells
2019-05-23 16:18 ` [PATCH 20/23] NFS: Deindent nfs_fs_context_parse_option() David Howells
2019-05-23 16:18 ` David Howells [this message]
2019-05-23 16:18 ` [PATCH 22/23] NFS: Do some tidying of the parsing code David Howells
2019-05-23 16:19 ` [PATCH 23/23] NFS: Add fs_context support David Howells
2019-05-25 23:08 ` Al Viro
2019-05-29 21:18 ` Schumaker, Anna
2019-06-06 9:41 ` David Howells
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