Fix a buffer release race condition, where the error value was used after release.

Fixes: b09a7a036d20 ("squashfs: support reading fragments in readahead call") Cc: stable@vger.kernel.org Signed-off-by: Phillip Lougher phillip@squashfs.org.uk --- fs/squashfs/file.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/fs/squashfs/file.c b/fs/squashfs/file.c index f0afd4d6fd30..8ba8c4c50770 100644 --- a/fs/squashfs/file.c +++ b/fs/squashfs/file.c @@ -506,8 +506,9 @@ static int squashfs_readahead_fragment(struct page **page, squashfs_i(inode)->fragment_size); struct squashfs_sb_info *msblk = inode->i_sb->s_fs_info; unsigned int n, mask = (1 << (msblk->block_log - PAGE_SHIFT)) - 1; + int error = buffer->error;

- if (buffer->error) + if (error) goto out;

expected += squashfs_i(inode)->fragment_offset; @@ -529,7 +530,7 @@ static int squashfs_readahead_fragment(struct page **page,

out: squashfs_cache_put(buffer); - return buffer->error; + return error; }

static void squashfs_readahead(struct readahead_control *ractl)