diff options
| author |   Kent Overstreet <koverstreet@google.com> | 2012-10-12 13:18:27 -0700 |
|---|---|---|
| committer | Kent Overstreet <koverstreet@google.com> | 2013-03-23 14:15:26 -0700 |
| commit | 6fda981cafbf908acd11e1e636fec50e99d56a47 (patch) | |
| tree | be6c8b95551a6081745ab937241dc4a3ef348676 | |
| parent | block: Avoid deadlocks with bio allocation by stacking drivers (diff) | |
| download | linux-dev-6fda981cafbf908acd11e1e636fec50e99d56a47.tar.xz linux-dev-6fda981cafbf908acd11e1e636fec50e99d56a47.zip | |
block: Fix a buffer overrun in bio_integrity_split()
bio_integrity_split() seemed to be confusing pointers and arrays -
bip_vec in bio_integrity_payload was an array appended to the end of the
payload, so the bio_vecs in struct bio_pair should have come after the
bio_integrity_payload they're for.
Fix it by making bip_vec a pointer to the inline vecs - a later patch is
going to make more use of this pointer.
Signed-off-by: Kent Overstreet <koverstreet@google.com>
CC: Jens Axboe <axboe@kernel.dk>
CC: Martin K. Petersen <martin.petersen@oracle.com>
| -rw-r--r-- | fs/bio-integrity.c | 5 | ||||
| -rw-r--r-- | include/linux/bio.h | 4 |
2 files changed, 6 insertions, 3 deletions
diff --git a/fs/bio-integrity.c b/fs/bio-integrity.c index a3f28f331b2b..94fa1c562c0e 100644 --- a/fs/bio-integrity.c +++ b/fs/bio-integrity.c @@ -112,6 +112,7 @@ struct bio_integrity_payload *bio_integrity_alloc(struct bio *bio, bip->bip_slab = idx; bip->bip_bio = bio; + bip->bip_vec = bip->bip_inline_vecs; bio->bi_integrity = bip; return bip; @@ -697,8 +698,8 @@ void bio_integrity_split(struct bio *bio, struct bio_pair *bp, int sectors) bp->iv1 = bip->bip_vec[0]; bp->iv2 = bip->bip_vec[0]; - bp->bip1.bip_vec[0] = bp->iv1; - bp->bip2.bip_vec[0] = bp->iv2; + bp->bip1.bip_vec = &bp->iv1; + bp->bip2.bip_vec = &bp->iv2; bp->iv1.bv_len = sectors * bi->tuple_size; bp->iv2.bv_offset += sectors * bi->tuple_size; diff --git a/include/linux/bio.h b/include/linux/bio.h index b31036ff779f..81004fdcc277 100644 --- a/include/linux/bio.h +++ b/include/linux/bio.h @@ -182,7 +182,9 @@ struct bio_integrity_payload { unsigned short bip_idx; /* current bip_vec index */ struct work_struct bip_work; /* I/O completion */ - struct bio_vec bip_vec[0]; /* embedded bvec array */ + + struct bio_vec *bip_vec; + struct bio_vec bip_inline_vecs[0];/* embedded bvec array */ }; #endif /* CONFIG_BLK_DEV_INTEGRITY */ |