Tsutomu Itoh
2012-Apr-12 04:47 UTC
[PATCH] Btrfs: check return value of bio_alloc() properly
bio_alloc() has the possibility of returning NULL.
So, it is necessary to check the return value.
Signed-off-by: Tsutomu Itoh <t-itoh@jp.fujitsu.com>
---
fs/btrfs/compression.c | 2 ++
fs/btrfs/extent_io.c | 4 ++++
fs/btrfs/scrub.c | 4 ++++
3 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c
index d11afa67..646f5e6 100644
--- a/fs/btrfs/compression.c
+++ b/fs/btrfs/compression.c
@@ -405,6 +405,7 @@ int btrfs_submit_compressed_write(struct inode *inode, u64
start,
bio_put(bio);
bio = compressed_bio_alloc(bdev, first_byte, GFP_NOFS);
+ BUG_ON(!bio);
bio->bi_private = cb;
bio->bi_end_io = end_compressed_bio_write;
bio_add_page(bio, page, PAGE_CACHE_SIZE, 0);
@@ -687,6 +688,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct
bio *bio,
comp_bio = compressed_bio_alloc(bdev, cur_disk_byte,
GFP_NOFS);
+ BUG_ON(!comp_bio);
comp_bio->bi_private = cb;
comp_bio->bi_end_io = end_compressed_bio_read;
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 0c3ec00..f5d4e2c 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2180,6 +2180,10 @@ static int bio_readpage_error(struct bio *failed_bio,
struct page *page,
}
bio = bio_alloc(GFP_NOFS, 1);
+ if (!bio) {
+ free_io_failure(inode, failrec, 0);
+ return -EIO;
+ }
bio->bi_private = state;
bio->bi_end_io = failed_bio->bi_end_io;
bio->bi_sector = failrec->logical >> 9;
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index c9a2c1a..60f0e28 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -1044,6 +1044,8 @@ static int scrub_recheck_block(struct btrfs_fs_info
*fs_info,
BUG_ON(!page->page);
bio = bio_alloc(GFP_NOFS, 1);
+ if (!bio)
+ return -EIO;
bio->bi_bdev = page->bdev;
bio->bi_sector = page->physical >> 9;
bio->bi_end_io = scrub_complete_bio_end_io;
@@ -1172,6 +1174,8 @@ static int scrub_repair_page_from_good_copy(struct
scrub_block *sblock_bad,
DECLARE_COMPLETION_ONSTACK(complete);
bio = bio_alloc(GFP_NOFS, 1);
+ if (!bio)
+ return -EIO;
bio->bi_bdev = page_bad->bdev;
bio->bi_sector = page_bad->physical >> 9;
bio->bi_end_io = scrub_complete_bio_end_io;
----
Tsutomu Itoh t-itoh@jp.fujitsu.com
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