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ksmbd: handle caseless file creation

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Ray Zhang reported ksmbd can not create file if parent filename is
caseless.

Y:\>mkdir A
Y:\>echo 123 >a\b.txt
The system cannot find the path specified.
Y:\>echo 123 >A\b.txt

This patch convert name obtained by caseless lookup to parent name.

Cc: stable@vger.kernel.org # v5.15+
Reported-by: Ray Zhang <zhanglei002@gmail.com>
Signed-off-by: Namjae Jeon <linkinjeon@kernel.org>
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Namjae Jeon 2024-09-08 15:23:48 +09:00 • committed by Steve French
parent ca4974ca95
commit c5a709f08d
1 changed files with 3 additions and 7 deletions
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10
fs/smb/server/vfs.c
View file

@ -1167,7 +1167,7 @@ static bool __caseless_lookup(struct dir_context *ctx, const char *name,
if (cmp < 0) if (cmp < 0)
cmp = strncasecmp((char *)buf->private, name, namlen); cmp = strncasecmp((char *)buf->private, name, namlen);
if (!cmp) { if (!cmp) {
memcpy((char *)buf->private, name, namlen); memcpy((char *)buf->private, name, buf->used);
buf->dirent_count = 1; buf->dirent_count = 1;
return false; return false;
} }
@ -1235,10 +1235,7 @@ int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
char *filepath; char *filepath;
size_t path_len, remain_len; size_t path_len, remain_len;
filepath = kstrdup(name, GFP_KERNEL); filepath = name;
if (!filepath)
return -ENOMEM;
path_len = strlen(filepath); path_len = strlen(filepath);
remain_len = path_len; remain_len = path_len;
@ -1281,10 +1278,9 @@ int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name,
err = -EINVAL; err = -EINVAL;
out2: out2:
path_put(parent_path); path_put(parent_path);
out1:
kfree(filepath);
} }
out1:
if (!err) { if (!err) {
err = mnt_want_write(parent_path->mnt); err = mnt_want_write(parent_path->mnt);
if (err) { if (err) {