6.1-stable review patch. If anyone has any objections, please let me know.
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From: Namjae Jeon linkinjeon@kernel.org
commit c5a709f08d40b1a082e44ffcde1aea4d2822ddd5 upstream.
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 Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/smb/server/vfs.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-)
--- a/fs/smb/server/vfs.c +++ b/fs/smb/server/vfs.c @@ -1154,7 +1154,7 @@ static bool __caseless_lookup(struct dir if (cmp < 0) cmp = strncasecmp((char *)buf->private, name, namlen); if (!cmp) { - memcpy((char *)buf->private, name, namlen); + memcpy((char *)buf->private, name, buf->used); buf->dirent_count = 1; return false; } @@ -1220,10 +1220,7 @@ int ksmbd_vfs_kern_path_locked(struct ks char *filepath; size_t path_len, remain_len;
- filepath = kstrdup(name, GFP_KERNEL); - if (!filepath) - return -ENOMEM; - + filepath = name; path_len = strlen(filepath); remain_len = path_len;
@@ -1266,10 +1263,9 @@ int ksmbd_vfs_kern_path_locked(struct ks err = -EINVAL; out2: path_put(parent_path); -out1: - kfree(filepath); }
+out1: if (!err) { err = mnt_want_write(parent_path->mnt); if (err) {