On 11/4/19 5:06 PM, Pete Batard wrote:
From: Andrei Warkentin <andrey.warken...@gmail.com>

It is possible for the command line to be empty
(Cmd->TagHead.TagValueSize = 0), in which case the code should not
attempt to read the value at CommandLine[-1].

Oops...

Reviewed-by: Philippe Mathieu-Daude <phi...@redhat.com>

Signed-off-by: Pete Batard <p...@akeo.ie>
---
  Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c | 3 ++-
  1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c 
b/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c
index 5a9d4c3f1787..9b4aa068857c 100644
--- a/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c
+++ b/Platform/RaspberryPi/Drivers/RpiFirmwareDxe/RpiFirmwareDxe.c
@@ -927,7 +927,8 @@ RpiFirmwareGetCommmandLine (
CopyMem (CommandLine, Cmd->CommandLine, Cmd->TagHead.TagValueSize); - if (CommandLine[Cmd->TagHead.TagValueSize - 1] != '\0') {
+  if (Cmd->TagHead.TagValueSize == 0 ||
+      CommandLine[Cmd->TagHead.TagValueSize - 1] != '\0') {
      //
      // Add a NUL terminator if required.
      //



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