rgw: Fix Browser POST content-length-range min value

`ERR_TOO_SMALL` is wrongly returned if all of the following are true,
- the get_data returns multiple items (chunks)
- the length of the last item is smaller than the POST Policy's min
  value for content-length-range.

The check should be `(ofs < min_len)` instead of `(len < min_len)`

This is further confirmed by the next line of `s->obj_size = ofs`

Move the `int len` scope inside loop to try and prevent the bug in
future.

The bug was refactored in 2016, but was introduced in Oct 2012, when
this functionality was first added to RGW in commit 7bb3504d3f0974e9863f536e9af0ce8889d6888f.

Reference: https://github.com/ceph/ceph/blob/933a42f9af349b3b222270e7f19f1fe151d89e8e/src/rgw/rgw_op.cc#L4474-L4513
Reference: https://github.com/ceph/ceph/commit/7bb3504d3f0974e9863f536e9af0ce8889d6888f
Signed-off-by: Robin H. Johnson <rjohnson@digitalocean.com>

diff --git a/src/rgw/rgw_op.cc b/src/rgw/rgw_op.cc
index 5bb0d398822546d97a5176f7e359cb59e9d57d27..e9847220fe8579134be43f56f8c5918e905e2ba1 100644 (file)
--- a/src/rgw/rgw_op.cc
+++ b/src/rgw/rgw_op.cc
@@ -4409,7 +4409,6 @@ void RGWPostObj::execute(optional_yield y)
     // Allow use of MD5 digest in FIPS mode for non-cryptographic purposes
     hash.SetFlags(EVP_MD_CTX_FLAG_NON_FIPS_ALLOW);
     ceph::buffer::list bl, aclbl;
-    int len = 0;
 
     op_ret = s->bucket->check_quota(this, quota, s->content_length, y);
     if (op_ret < 0) {
@@ -4473,7 +4472,7 @@ void RGWPostObj::execute(optional_yield y)
     bool again;
     do {
       ceph::bufferlist data;
-      len = get_data(data, again);
+      int len = get_data(data, again);
 
       if (len < 0) {
         op_ret = len;
@@ -4504,7 +4503,7 @@ void RGWPostObj::execute(optional_yield y)
       return;
     }
 
-    if (len < min_len) {
+    if (ofs < min_len) {
       op_ret = -ERR_TOO_SMALL;
       return;
     }