From: Al Viro <viro@zeniv.linux.org.uk>
Date: Fri, 5 Mar 2021 15:02:34 -0500
Subject: [PATCH] cifs: don't cargo-cult strndup()
Git-commit: 8d7672235533dbeab4a5373b49f1b4273cdc2c6a
References: bsc#1185902
Patch-mainline: v5.13-rc1
strndup(s, strlen(s)) is a highly unidiomatic way to spell strdup(s);
it's *NOT* safer in any way, since strlen() is just as sensitive to
NUL-termination as strdup() is.
strndup() is for situations when you need a copy of a known-sized
substring, not a magic security juju to drive the bad spirits away.
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Steve French <stfrench@microsoft.com>
Acked-by: Paulo Alcantara <palcantara@suse.de>
---
fs/cifs/cifs_dfs_ref.c | 2 +-
fs/cifs/connect.c | 9 +++------
fs/cifs/dfs_cache.c | 18 +++++++++---------
fs/cifs/fs_context.c | 2 +-
fs/cifs/misc.c | 2 +-
fs/cifs/smb1ops.c | 4 +---
fs/cifs/unc.c | 4 +---
7 files changed, 17 insertions(+), 24 deletions(-)
diff --git a/fs/cifs/cifs_dfs_ref.c b/fs/cifs/cifs_dfs_ref.c
index 6b1ce4efb591..ecee2864972d 100644
--- a/fs/cifs/cifs_dfs_ref.c
+++ b/fs/cifs/cifs_dfs_ref.c
@@ -270,7 +270,7 @@ static struct vfsmount *cifs_dfs_do_mount(struct dentry *mntpt,
char *mountdata;
char *devname;
- devname = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
+ devname = kstrdup(fullpath, GFP_KERNEL);
if (!devname)
return ERR_PTR(-ENOMEM);
diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c
index 35dbb9c836ea..121d8b4535b0 100644
--- a/fs/cifs/connect.c
+++ b/fs/cifs/connect.c
@@ -1778,9 +1778,7 @@ cifs_set_cifscreds(struct smb3_fs_context *ctx, struct cifs_ses *ses)
* for the request.
*/
if (is_domain && ses->domainName) {
- ctx->domainname = kstrndup(ses->domainName,
- strlen(ses->domainName),
- GFP_KERNEL);
+ ctx->domainname = kstrdup(ses->domainName, GFP_KERNEL);
if (!ctx->domainname) {
cifs_dbg(FYI, "Unable to allocate %zd bytes for domain\n",
len);
@@ -3411,8 +3409,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
goto error;
}
/* Save mount options */
- mntdata = kstrndup(cifs_sb->ctx->mount_options,
- strlen(cifs_sb->ctx->mount_options), GFP_KERNEL);
+ mntdata = kstrdup(cifs_sb->ctx->mount_options, GFP_KERNEL);
if (!mntdata) {
rc = -ENOMEM;
goto error;
@@ -3485,7 +3482,7 @@ int cifs_mount(struct cifs_sb_info *cifs_sb, struct smb3_fs_context *ctx)
* links, the prefix path is included in both and may be changed during reconnect. See
* cifs_tree_connect().
*/
- cifs_sb->origin_fullpath = kstrndup(full_path, strlen(full_path), GFP_KERNEL);
+ cifs_sb->origin_fullpath = kstrdup(full_path, GFP_KERNEL);
if (!cifs_sb->origin_fullpath) {
rc = -ENOMEM;
goto error;
diff --git a/fs/cifs/dfs_cache.c b/fs/cifs/dfs_cache.c
index 098b4bc8da59..e4617ccf0a23 100644
--- a/fs/cifs/dfs_cache.c
+++ b/fs/cifs/dfs_cache.c
@@ -89,7 +89,7 @@ static int get_normalized_path(const char *path, char **npath)
if (*path == '\\') {
*npath = (char *)path;
} else {
- *npath = kstrndup(path, strlen(path), GFP_KERNEL);
+ *npath = kstrdup(path, GFP_KERNEL);
if (!*npath)
return -ENOMEM;
convert_delimiter(*npath, '\\');
@@ -358,7 +358,7 @@ static struct cache_dfs_tgt *alloc_target(const char *name, int path_consumed)
t = kmalloc(sizeof(*t), GFP_ATOMIC);
if (!t)
return ERR_PTR(-ENOMEM);
- t->name = kstrndup(name, strlen(name), GFP_ATOMIC);
+ t->name = kstrdup(name, GFP_ATOMIC);
if (!t->name) {
kfree(t);
return ERR_PTR(-ENOMEM);
@@ -419,7 +419,7 @@ static struct cache_entry *alloc_cache_entry(const char *path,
if (!ce)
return ERR_PTR(-ENOMEM);
- ce->path = kstrndup(path, strlen(path), GFP_KERNEL);
+ ce->path = kstrdup(path, GFP_KERNEL);
if (!ce->path) {
kmem_cache_free(cache_slab, ce);
return ERR_PTR(-ENOMEM);
@@ -531,7 +531,7 @@ static struct cache_entry *lookup_cache_entry(const char *path, unsigned int *ha
char *s, *e;
char sep;
- npath = kstrndup(path, strlen(path), GFP_KERNEL);
+ npath = kstrdup(path, GFP_KERNEL);
if (!npath)
return ERR_PTR(-ENOMEM);
@@ -641,7 +641,7 @@ static int __update_cache_entry(const char *path,
if (ce->tgthint) {
s = ce->tgthint->name;
- th = kstrndup(s, strlen(s), GFP_ATOMIC);
+ th = kstrdup(s, GFP_ATOMIC);
if (!th)
return -ENOMEM;
}
@@ -786,11 +786,11 @@ static int setup_referral(const char *path, struct cache_entry *ce,
memset(ref, 0, sizeof(*ref));
- ref->path_name = kstrndup(path, strlen(path), GFP_ATOMIC);
+ ref->path_name = kstrdup(path, GFP_ATOMIC);
if (!ref->path_name)
return -ENOMEM;
- ref->node_name = kstrndup(target, strlen(target), GFP_ATOMIC);
+ ref->node_name = kstrdup(target, GFP_ATOMIC);
if (!ref->node_name) {
rc = -ENOMEM;
goto err_free_path;
@@ -828,7 +828,7 @@ static int get_targets(struct cache_entry *ce, struct dfs_cache_tgt_list *tl)
goto err_free_it;
}
- it->it_name = kstrndup(t->name, strlen(t->name), GFP_ATOMIC);
+ it->it_name = kstrdup(t->name, GFP_ATOMIC);
if (!it->it_name) {
kfree(it);
rc = -ENOMEM;
@@ -1166,7 +1166,7 @@ int dfs_cache_add_vol(char *mntdata, struct smb3_fs_context *ctx, const char *fu
if (!vi)
return -ENOMEM;
- vi->fullpath = kstrndup(fullpath, strlen(fullpath), GFP_KERNEL);
+ vi->fullpath = kstrdup(fullpath, GFP_KERNEL);
if (!vi->fullpath) {
rc = -ENOMEM;
goto err_free_vi;
diff --git a/fs/cifs/fs_context.c b/fs/cifs/fs_context.c
index 78889024a7ed..7652f73e1bcc 100644
--- a/fs/cifs/fs_context.c
+++ b/fs/cifs/fs_context.c
@@ -430,7 +430,7 @@ int smb3_parse_opt(const char *options, const char *key, char **val)
if (nval == p)
continue;
*nval++ = 0;
- *val = kstrndup(nval, strlen(nval), GFP_KERNEL);
+ *val = kstrdup(nval, GFP_KERNEL);
rc = !*val ? -ENOMEM : 0;
goto out;
}
diff --git a/fs/cifs/misc.c b/fs/cifs/misc.c
index 82e176720ca6..c15a90e422be 100644
--- a/fs/cifs/misc.c
+++ b/fs/cifs/misc.c
@@ -1180,7 +1180,7 @@ int update_super_prepath(struct cifs_tcon *tcon, char *prefix)
kfree(cifs_sb->prepath);
if (prefix && *prefix) {
- cifs_sb->prepath = kstrndup(prefix, strlen(prefix), GFP_ATOMIC);
+ cifs_sb->prepath = kstrdup(prefix, GFP_ATOMIC);
if (!cifs_sb->prepath) {
rc = -ENOMEM;
goto out;
diff --git a/fs/cifs/smb1ops.c b/fs/cifs/smb1ops.c
index e31b939e628c..85fa254c7a6b 100644
--- a/fs/cifs/smb1ops.c
+++ b/fs/cifs/smb1ops.c
@@ -926,9 +926,7 @@ cifs_unix_dfs_readlink(const unsigned int xid, struct cifs_tcon *tcon,
0);
if (!rc) {
- *symlinkinfo = kstrndup(referral.node_name,
- strlen(referral.node_name),
- GFP_KERNEL);
+ *symlinkinfo = kstrdup(referral.node_name, GFP_KERNEL);
free_dfs_info_param(&referral);
if (!*symlinkinfo)
rc = -ENOMEM;
diff --git a/fs/cifs/unc.c b/fs/cifs/unc.c
index 394aa00cea40..f6fc5e343ea4 100644
--- a/fs/cifs/unc.c
+++ b/fs/cifs/unc.c
@@ -50,7 +50,6 @@ char *extract_sharename(const char *unc)
{
const char *src;
char *delim, *dst;
- int len;
/* skip double chars at the beginning */
src = unc + 2;
@@ -60,10 +59,9 @@ char *extract_sharename(const char *unc)
if (!delim)
return ERR_PTR(-EINVAL);
delim++;
- len = strlen(delim);
/* caller has to free the memory */
- dst = kstrndup(delim, len, GFP_KERNEL);
+ dst = kstrdup(delim, GFP_KERNEL);
if (!dst)
return ERR_PTR(-ENOMEM);
--
2.33.1