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| author | Josef Bacik <jbacik@fusionio.com> | 2012-10-05 13:39:50 -0400 |
|---|---|---|
| committer | Chris Mason <chris.mason@fusionio.com> | 2012-10-09 09:20:25 -0400 |
| commit | 15e3004a0eb2c4879bc666d0e6a3acd973fb226c (patch) | |
| tree | 8a811ff44a0763227ddfb27eec702593c765c356 /fs/btrfs/compression.c | |
| parent | 5af3e8cce8b7ba0a2819e18c9146c8c0b452d479 (diff) | |
| download | linux-15e3004a0eb2c4879bc666d0e6a3acd973fb226c.tar.gz linux-15e3004a0eb2c4879bc666d0e6a3acd973fb226c.tar.bz2 linux-15e3004a0eb2c4879bc666d0e6a3acd973fb226c.zip | |
Btrfs: cleanup pages properly when ENOMEM in compression
We were freeing non-existent pages which was causing a panic for a user who
was suffering from ENOMEM. This patch fixes the problem. Thanks,
Reported-by: Jérôme Poulin <jeromepoulin@gmail.com>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to 'fs/btrfs/compression.c')
| -rw-r--r-- | fs/btrfs/compression.c | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/fs/btrfs/compression.c b/fs/btrfs/compression.c index 43d1c5a3a030..c6467aa88bee 100644 --- a/fs/btrfs/compression.c +++ b/fs/btrfs/compression.c @@ -577,6 +577,7 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, u64 em_start; struct extent_map *em; int ret = -ENOMEM; + int faili = 0; u32 *sums; tree = &BTRFS_I(inode)->io_tree; @@ -626,9 +627,13 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, for (pg_index = 0; pg_index < nr_pages; pg_index++) { cb->compressed_pages[pg_index] = alloc_page(GFP_NOFS | __GFP_HIGHMEM); - if (!cb->compressed_pages[pg_index]) + if (!cb->compressed_pages[pg_index]) { + faili = pg_index - 1; + ret = -ENOMEM; goto fail2; + } } + faili = nr_pages - 1; cb->nr_pages = nr_pages; add_ra_bio_pages(inode, em_start + em_len, cb); @@ -713,8 +718,10 @@ int btrfs_submit_compressed_read(struct inode *inode, struct bio *bio, return 0; fail2: - for (pg_index = 0; pg_index < nr_pages; pg_index++) - free_page((unsigned long)cb->compressed_pages[pg_index]); + while (faili >= 0) { + __free_page(cb->compressed_pages[faili]); + faili--; + } kfree(cb->compressed_pages); fail1: |