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* grub-core/kern/file.c (grub_file_read): Read nothing if len = 0.

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Special behaviour for len = 0 to read whole file isn't used anywhere and
	can cause buffer ovewrflows in several places.
This commit is contained in:
Vladimir 'phcoder' Serbinenko 2012-05-01 15:08:29 +02:00
parent f0a53ed2c2
commit a188012e6c
2 changed files with 10 additions and 1 deletions
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5
grub-core/kern/file.c
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@ -143,7 +143,10 @@ grub_file_read (grub_file_t file, void *buf, grub_size_t len)
return -1;
}
if (len == 0 || len > file->size - file->offset)
if (len == 0)
return 0;
if (len > file->size - file->offset)
len = file->size - file->offset;
/* Prevent an overflow. */