libpciaccess ROM read reads more than advertised

[Pierre Willenbrock]

Hi,

i noticed the amount of data read by pci_device_linux_sysfs_read_rom is
determined by the file size from sysfs, while the rom_size reported to
the drivers is calculated using a different algorithm. This leads to
invalid memory writes if the file size is greater than the calculated
size. Possible patch attached.

Regards,
  Pierre
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