From c5a709f08d40b1a082e44ffcde1aea4d2822ddd5 Mon Sep 17 00:00:00 2001 From: Namjae Jeon Date: Sun, 8 Sep 2024 15:23:48 +0900 Subject: [PATCH] ksmbd: handle caseless file creation 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 Signed-off-by: Namjae Jeon Signed-off-by: Steve French --- fs/smb/server/vfs.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) diff --git a/fs/smb/server/vfs.c b/fs/smb/server/vfs.c index 13dad48d950c9..7cbd580120d12 100644 --- a/fs/smb/server/vfs.c +++ b/fs/smb/server/vfs.c @@ -1167,7 +1167,7 @@ static bool __caseless_lookup(struct dir_context *ctx, const char *name, 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; } @@ -1235,10 +1235,7 @@ int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name, 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; @@ -1281,10 +1278,9 @@ int ksmbd_vfs_kern_path_locked(struct ksmbd_work *work, char *name, err = -EINVAL; out2: path_put(parent_path); -out1: - kfree(filepath); } +out1: if (!err) { err = mnt_want_write(parent_path->mnt); if (err) { -- 2.39.5