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Michael Brown 4a7f64bf4f [efi] Allow for fact that SNP device may be removed by executed image 
The executed image may call DisconnectController() to remove our
network device.  This will leave the net device unregistered but not
yet freed (since our installed PXE base code protocol retains a
reference to the net device).

Unregistration will cause the network upper-layer driver removal
functions to be called, which will free the SNP device structure.
When the image returns from StartImage(), the snpdev pointer may
therefore no longer be valid.

The SNP device structure is not reference counted, and so we cannot
simply take out a reference to ensure that it remains valid across the
call to StartImage().  However, the code path following the call to
StartImage() doesn't actually require the SNP device pointer, only the
EFI device handle.

Store the device handle in a local variable and ensure that snpdev is
invalidated before the call to StartImage() so that future code cannot
accidentally reintroduce this issue.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
 		2025-03-29 22:07:13 +00:00
.github/workflows [ci] Update action versions to silence GitHub warnings 2024-03-07 23:25:35 +00:00
contrib [crypto] Update cmsdetach to work with python-asn1 version 3.0.0 2025-03-17 11:48:06 +00:00
src [efi] Allow for fact that SNP device may be removed by executed image 2025-03-29 22:07:13 +00:00
COPYING [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.GPLv2 [legal] Update GPLv2 licence text 2015-02-26 17:59:53 +00:00
COPYING.UBDL [legal] Add support for the Unmodified Binary Distribution Licence 2015-03-02 12:07:14 +00:00
README [doc] Re-add README file 2010-05-28 00:03:47 +01:00

README 

iPXE README File

Quick start guide:

   cd src
   make

For any more detailed instructions, see http://ipxe.org