diff options
| -rw-r--r-- | drivers/target/target_core_file.c | 23 |
1 files changed, 17 insertions, 6 deletions
diff --git a/drivers/target/target_core_file.c b/drivers/target/target_core_file.c index 87aa376a1a1a..dd8f32055266 100644 --- a/drivers/target/target_core_file.c +++ b/drivers/target/target_core_file.c @@ -277,12 +277,11 @@ static int fd_do_rw(struct se_cmd *cmd, struct file *fd, else ret = vfs_iter_read(fd, &iter, &pos); - kfree(bvec); - if (is_write) { if (ret < 0 || ret != data_length) { pr_err("%s() write returned %d\n", __func__, ret); - return (ret < 0 ? ret : -EINVAL); + if (ret >= 0) + ret = -EINVAL; } } else { /* @@ -295,17 +294,29 @@ static int fd_do_rw(struct se_cmd *cmd, struct file *fd, pr_err("%s() returned %d, expecting %u for " "S_ISBLK\n", __func__, ret, data_length); - return (ret < 0 ? ret : -EINVAL); + if (ret >= 0) + ret = -EINVAL; } } else { if (ret < 0) { pr_err("%s() returned %d for non S_ISBLK\n", __func__, ret); - return ret; + } else if (ret != data_length) { + /* + * Short read case: + * Probably some one truncate file under us. + * We must explicitly zero sg-pages to prevent + * expose uninizialized pages to userspace. + */ + if (ret < data_length) + ret += iov_iter_zero(data_length - ret, &iter); + else + ret = -EINVAL; } } } - return 1; + kfree(bvec); + return ret; } static sense_reason_t |