From: Peng Fan Date: Wed, 28 Apr 2021 13:54:01 +0000 (+0800) Subject: efi_loader: loosen buffer parameter check in efi_file_read_int X-Git-Url: http://git.dujemihanovic.xyz/login.html?a=commitdiff_plain;h=bc3f46518176e541c767b099fb06ad1870d59fa5;p=u-boot.git efi_loader: loosen buffer parameter check in efi_file_read_int This is same issue as https://bugzilla.redhat.com/show_bug.cgi?id=1733817, but that fix was wrongly partial reverted. When reading a directory, EFI_BUFFER_TOO_SMALL should be returned when the supplied buffer is too small, so a use-case is to call EFI_FILE_PROTOCOL.Read() with *buffer_size=0 and buffer=NULL to obtain the needed size before doing the actual read. So remove the check only for directory reading, file reading already do the check by itself. Fixes: db12f518edb0("efi_loader: implement non-blocking file services") Signed-off-by: Peng Fan Cc: Stefan Sørensen Tested-by: Peter Robinson Reviewed-by: Heinrich Schuchardt --- diff --git a/lib/efi_loader/efi_file.c b/lib/efi_loader/efi_file.c index 204105e25a..6b3f5962be 100644 --- a/lib/efi_loader/efi_file.c +++ b/lib/efi_loader/efi_file.c @@ -554,7 +554,7 @@ static efi_status_t efi_file_read_int(struct efi_file_handle *this, efi_status_t ret = EFI_SUCCESS; u64 bs; - if (!this || !buffer_size || !buffer) + if (!this || !buffer_size) return EFI_INVALID_PARAMETER; bs = *buffer_size;