svn commit: r343911 - head/stand/efi/libefi

Marcin Wojtas mw at
Fri Feb 8 14:56:29 UTC 2019

Author: mw
Date: Fri Feb  8 14:56:28 2019
New Revision: 343911

  Allow reading the UEFI variable size
  When loading bigger variables form UEFI it is necessary to know their
  size beforehand, so that an appropriate amount of memory can be
  allocated. The easiest way to do this is to try to read the variable
  with buffer size equal 0, expecting EFI_BUFFER_TOO_SMALL error to be
  returned. Allow such possible approach in efi_getenv routine.
  Extracted from a bigger patch as suggested by imp.
  Submitted by: Kornel Duleba <mindal at>
  Obtained from: Semihalf
  Sponsored by: Stormshield


Modified: head/stand/efi/libefi/efienv.c
--- head/stand/efi/libefi/efienv.c	Fri Feb  8 14:32:27 2019	(r343910)
+++ head/stand/efi/libefi/efienv.c	Fri Feb  8 14:56:28 2019	(r343911)
@@ -48,7 +48,7 @@ efi_getenv(EFI_GUID *g, const char *v, void *data, siz
 	dl = *len;
 	rv = RS->GetVariable(uv, g, &attr, &dl, data);
-	if (rv == EFI_SUCCESS)
+	if (rv == EFI_SUCCESS || rv == EFI_BUFFER_TOO_SMALL)
 		*len = dl;
 	return (rv);

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