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ore: Fix out-of-bounds access in _ios_obj() 

_ios_obj() is accessed by group_index not device_table index.

The oc->comps array is only a group_full of devices at a time
it is not like ore_comp_dev() which is indexed by a global
device_table index.

This did not BUG until now because exofs only uses a single
COMP for all devices. But with other FSs like PanFS this is
not true.

This bug was only in the write_path, all other users were
using it correctly

[This is a bug since 3.2 Kernel]
CC: Stable Tree <stable@kernel.org>

Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
This commit is contained in:
Boaz Harrosh 2012-08-01 17:48:36 +03:00
parent be388f3d9a
commit 9e62bb4458
1 changed files with 7 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
fs/exofs/ore.c
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@ -837,11 +837,11 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
bio->bi_rw |= REQ_WRITE; bio->bi_rw |= REQ_WRITE;
} }
osd_req_write(or, _ios_obj(ios, dev), per_dev->offset, osd_req_write(or, _ios_obj(ios, cur_comp),
bio, per_dev->length); per_dev->offset, bio, per_dev->length);
ORE_DBGMSG("write(0x%llx) offset=0x%llx " ORE_DBGMSG("write(0x%llx) offset=0x%llx "
"length=0x%llx dev=%d\n", "length=0x%llx dev=%d\n",
_LLU(_ios_obj(ios, dev)->id), _LLU(_ios_obj(ios, cur_comp)->id),
_LLU(per_dev->offset), _LLU(per_dev->offset),
_LLU(per_dev->length), dev); _LLU(per_dev->length), dev);
} else if (ios->kern_buff) { } else if (ios->kern_buff) {
@ -853,20 +853,20 @@ static int _write_mirror(struct ore_io_state *ios, int cur_comp)
(ios->si.unit_off + ios->length > (ios->si.unit_off + ios->length >
ios->layout->stripe_unit)); ios->layout->stripe_unit));
ret = osd_req_write_kern(or, _ios_obj(ios, per_dev->dev), ret = osd_req_write_kern(or, _ios_obj(ios, cur_comp),
per_dev->offset, per_dev->offset,
ios->kern_buff, ios->length); ios->kern_buff, ios->length);
if (unlikely(ret)) if (unlikely(ret))
goto out; goto out;
ORE_DBGMSG2("write_kern(0x%llx) offset=0x%llx " ORE_DBGMSG2("write_kern(0x%llx) offset=0x%llx "
"length=0x%llx dev=%d\n", "length=0x%llx dev=%d\n",
_LLU(_ios_obj(ios, dev)->id), _LLU(_ios_obj(ios, cur_comp)->id),
_LLU(per_dev->offset), _LLU(per_dev->offset),
_LLU(ios->length), per_dev->dev); _LLU(ios->length), per_dev->dev);
} else { } else {
osd_req_set_attributes(or, _ios_obj(ios, dev)); osd_req_set_attributes(or, _ios_obj(ios, cur_comp));
ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n", ORE_DBGMSG2("obj(0x%llx) set_attributes=%d dev=%d\n",
_LLU(_ios_obj(ios, dev)->id), _LLU(_ios_obj(ios, cur_comp)->id),
ios->out_attr_len, dev); ios->out_attr_len, dev);
} }