From: James Bottomley Date: Sun, 8 Dec 2024 18:34:13 +0000 (-0500) Subject: efivarfs: Fix error on non-existent file X-Git-Tag: v6.1.122~47 X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=ab765320c07ee16cfbc37828e7098cca0e706776;p=thirdparty%2Fkernel%2Fstable.git efivarfs: Fix error on non-existent file commit 2ab0837cb91b7de507daa145d17b3b6b2efb3abf upstream. When looking up a non-existent file, efivarfs returns -EINVAL if the file does not conform to the NAME-GUID format and -ENOENT if it does. This is caused by efivars_d_hash() returning -EINVAL if the name is not formatted correctly. This error is returned before simple_lookup() returns a negative dentry, and is the error value that the user sees. Fix by removing this check. If the file does not exist, simple_lookup() will return a negative dentry leading to -ENOENT and efivarfs_create() already has a validity check before it creates an entry (and will correctly return -EINVAL) Signed-off-by: James Bottomley Cc: [ardb: make efivarfs_valid_name() static] Signed-off-by: Ard Biesheuvel Signed-off-by: Greg Kroah-Hartman --- diff --git a/fs/efivarfs/inode.c b/fs/efivarfs/inode.c index 939e5e242b985..b3dc7ff42400f 100644 --- a/fs/efivarfs/inode.c +++ b/fs/efivarfs/inode.c @@ -47,7 +47,7 @@ struct inode *efivarfs_get_inode(struct super_block *sb, * * VariableName-12345678-1234-1234-1234-1234567891bc */ -bool efivarfs_valid_name(const char *str, int len) +static bool efivarfs_valid_name(const char *str, int len) { const char *s = str + len - EFI_VARIABLE_GUID_LEN; diff --git a/fs/efivarfs/internal.h b/fs/efivarfs/internal.h index 8ebf3a6a8aa2d..dcb973d8736cd 100644 --- a/fs/efivarfs/internal.h +++ b/fs/efivarfs/internal.h @@ -50,7 +50,6 @@ bool efivar_variable_is_removable(efi_guid_t vendor, const char *name, extern const struct file_operations efivarfs_file_operations; extern const struct inode_operations efivarfs_dir_inode_operations; -extern bool efivarfs_valid_name(const char *str, int len); extern struct inode *efivarfs_get_inode(struct super_block *sb, const struct inode *dir, int mode, dev_t dev, bool is_removable); diff --git a/fs/efivarfs/super.c b/fs/efivarfs/super.c index 77c7615bba5e1..b8c4641ed152b 100644 --- a/fs/efivarfs/super.c +++ b/fs/efivarfs/super.c @@ -64,9 +64,6 @@ static int efivarfs_d_hash(const struct dentry *dentry, struct qstr *qstr) const unsigned char *s = qstr->name; unsigned int len = qstr->len; - if (!efivarfs_valid_name(s, len)) - return -EINVAL; - while (len-- > EFI_VARIABLE_GUID_LEN) hash = partial_name_hash(*s++, hash);