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grub_fshelp_read_file: Don't attempt to read past the end of file.

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This commit is contained in:
Vladimir Serbinenko 2015-01-20 12:58:17 +01:00
parent 66ce4d1aef
commit af435524cd
2 changed files with 12 additions and 0 deletions
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7
grub-core/fs/fshelp.c
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@ -252,6 +252,13 @@ grub_fshelp_read_file (grub_disk_t disk, grub_fshelp_node_t node,
grub_disk_addr_t i, blockcnt;
int blocksize = 1 << (log2blocksize + GRUB_DISK_SECTOR_BITS);
if (pos > filesize)
{
grub_error (GRUB_ERR_OUT_OF_RANGE,
N_("attempt to read past the end of file"));
return -1;
}
/* Adjust LEN so it we can't read past the end of the file. */
if (pos + len > filesize)
len = filesize - pos;