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Leif Lindholm authored
The EFI version of grub_machine_get_bootlocation crops the boot image name back to the last / in order to get a directory path. However, it does not check that *name is actually set before calling grub_strrchr to do this, and neither does grub_strrchr before dereferencing a NULL pointer. Parent function, grub_set_prefix_and_root, does check the pointer before using.
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