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efi: check *path non-null before grub_strrchr

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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.
This commit is contained in:
Leif Lindholm 2014-11-17 14:11:01 +00:00
parent 72ec399ad8
commit 004a2b1efd
2 changed files with 12 additions and 4 deletions
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11
grub-core/kern/efi/init.c
View file

@ -63,10 +63,13 @@ grub_machine_get_bootlocation (char **device, char **path)
if (!*device && grub_efi_net_config)
grub_efi_net_config (image->device_handle, device, path);
/* Get the directory. */
p = grub_strrchr (*path, '/');
if (p)
*p = '\0';
if (*path)
{
/* Get the directory. */
p = grub_strrchr (*path, '/');
if (p)
*p = '\0';
}
}
void