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* grub-core/fs/zfs.c: Avoid divisions by zero.

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Vladimir Serbinenko 2015-01-20 17:46:55 +01:00
parent 9deb46e363
commit 475bffeae6
2 changed files with 16 additions and 0 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
2015-01-20 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/fs/zfs.c: Avoid divisions by zero.
2015-01-20 Vladimir Serbinenko <phcoder@gmail.com>
* grub-core/fs/btrfs.c: Avoid divisions by zero.

12
grub-core/fs/zfs/zfs.c
View file

@ -1501,6 +1501,9 @@ read_device (grub_uint64_t offset, struct grub_zfs_device_desc *desc,
return grub_error (GRUB_ERR_NOT_IMPLEMENTED_YET,
"raidz%d is not supported", desc->nparity);
if (desc->n_children <= desc->nparity || desc->n_children < 1)
return grub_error(GRUB_ERR_BAD_FS, "too little devices for given parity");
orig_s = (((len + (1 << desc->ashift) - 1) >> desc->ashift)
+ (desc->n_children - desc->nparity) - 1);
s = orig_s;
@ -2804,6 +2807,9 @@ dnode_get_path (struct subvolume *subvol, const char *path_in, dnode_end_t *dn,
dnode_path->dn.endian)
<< SPA_MINBLOCKSHIFT);
if (blksz == 0)
return grub_error(GRUB_ERR_BAD_FS, "0-sized block");
sym_value = grub_malloc (sym_sz);
if (!sym_value)
return grub_errno;
@ -3798,6 +3804,12 @@ grub_zfs_read (grub_file_t file, char *buf, grub_size_t len)
blksz = grub_zfs_to_cpu16 (data->dnode.dn.dn_datablkszsec,
data->dnode.endian) << SPA_MINBLOCKSHIFT;
if (blksz == 0)
{
grub_error (GRUB_ERR_BAD_FS, "0-sized block");
return -1;
}
/*
* Entire Dnode is too big to fit into the space available. We
* will need to read it in chunks. This could be optimized to