ebb3d958aa
grub_pubkey_open closed original file after it was read; it set io->device to NULL to prevent grub_file_close from trying to close device. But network device itself is stacked (net -> bufio); and bufio preserved original netfs file which hold reference to device. grub_file_close(io) called grub_bufio_close which called grub_file_close for original file. grub_file_close(netfs-file) now also called grub_device_close which freed file->device->net. So file structure returned by grub_pubkey_open now had device->net pointed to freed memory. When later file was closed, it was attempted to be freed again. Change grub_pubkey_open to behave like other filters - preserve original parent file and pass grub_file_close down to parent. In this way only the original file will close device. We really need to move this logic into core instead. Also plug memory leaks in error paths on the way. Reported-By: Robert Kliewer <robert.kliewer@gmail.com> Closes: bug #43601
This is GRUB 2, the second version of the GRand Unified Bootloader. GRUB 2 is rewritten from scratch to make GNU GRUB cleaner, safer, more robust, more powerful, and more portable. See the file NEWS for a description of recent changes to GRUB 2. See the file INSTALL for instructions on how to build and install the GRUB 2 data and program files. Please visit the official web page of GRUB 2, for more information. The URL is <http://www.gnu.org/software/grub/grub.html>. More extensive documentation is available in the Info manual, accessible using 'info grub' after building and installing GRUB 2. Please look at the GRUB Wiki <http://grub.enbug.org> for testing procedures. There are a number of important user-visible differences from the first version of GRUB, now known as GRUB Legacy. For a summary, please see: info grub Introduction 'Changes from GRUB Legacy'