diff options
| -rw-r--r-- | fs/exec.c | 29 |
1 files changed, 21 insertions, 8 deletions
diff --git a/fs/exec.c b/fs/exec.c index c4010b8207a1..fdecb7615587 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -850,15 +850,25 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size, if (ret) return ret; + ret = deny_write_access(file); + if (ret) + return ret; + i_size = i_size_read(file_inode(file)); - if (max_size > 0 && i_size > max_size) - return -EFBIG; - if (i_size <= 0) - return -EINVAL; + if (max_size > 0 && i_size > max_size) { + ret = -EFBIG; + goto out; + } + if (i_size <= 0) { + ret = -EINVAL; + goto out; + } *buf = vmalloc(i_size); - if (!*buf) - return -ENOMEM; + if (!*buf) { + ret = -ENOMEM; + goto out; + } pos = 0; while (pos < i_size) { @@ -876,18 +886,21 @@ int kernel_read_file(struct file *file, void **buf, loff_t *size, if (pos != i_size) { ret = -EIO; - goto out; + goto out_free; } ret = security_kernel_post_read_file(file, *buf, i_size, id); if (!ret) *size = pos; -out: +out_free: if (ret < 0) { vfree(*buf); *buf = NULL; } + +out: + allow_write_access(file); return ret; } EXPORT_SYMBOL_GPL(kernel_read_file); |