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memory leak issue #172

Merged
merged 5 commits into from
Nov 7, 2017
Merged

memory leak issue #172

merged 5 commits into from
Nov 7, 2017

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gaoethan
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@gaoethan gaoethan commented Nov 1, 2017

Failing to save or free storage allocated from
rcutils_join_path(), which results in memory leak

Signed-off-by: Ethan Gao ethan.gao@linux.intel.com

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Good catch, this is definitely a memory leak. I've got a couple of suggestions to simplify the code, but once those are fixed I think I'm good with this change.

return false;
file_path = rcutils_join_path(node_secure_root, file_names[i]);
if (file_path) {
if (!rcutils_is_readable(std::string(file_path).c_str())) {
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There's no real reason to wrap this in a std::string, and then get the c_str out of it; file_path is already a C-style string. Just do if (!rcutils_is_readable(file_path)) {

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it makes sense, I initially kept it as the original :) and now it's revised

}

file_path = nullptr;
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There's no need to set file_path to nullptr here; it is a stack variable, so is going out of scope immediately. It probably doesn't matter for the final code (I'm assuming the compiler will optimize this away), but static analyzers will probably pick this up as a statement that has no effect.

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generally speaking, it's safer with specified manually, but that's not mandatory for modern compiler now, removing is oaky as well 😄 , thanks.

if (file_path) {
if (!rcutils_is_readable(std::string(file_path).c_str())) {
free(file_path);
file_path = nullptr;
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There's no need to set file_path to nullptr here; it is a stack variable, so is going out of scope immediately. It probably doesn't matter for the final code (I'm assuming the compiler will optimize this away), but static analyzers will probably pick this up as a statement that has no effect. The same below at the final return in the function.

gaoethan and others added 2 commits November 2, 2017 01:02
Failing to save or free storage allocated from
rcutils_join_path(), which results in memory leak

Signed-off-by: Ethan Gao <ethan.gao@linux.intel.com>
@clalancette clalancette added the in review Waiting for review (Kanban column) label Nov 1, 2017
security_files_paths[i] = std::string(file_prefix + file_path);
free(file_path);
} else {
RMW_SET_ERROR_MSG("Failed to allocate memory to get security file path");
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Sorry I didn't notice this before, but I think we still have a leak here. Consider the case where we successfully find and allocate ca.cert.pem, but fail to find cert.pem. In that case, we'll have allocated memory for ca.cert.pem, failed to find cert.pem, freed the memory for cert.pem, then returned false. At which point create_node will assume the entire function failed, and we'll still leak the memory for ca.cert.pem. I think we'll probably want to make the contract for get_security_file_paths such that they all succeed, or none of them do. In that case, I think we need to unwind any allocations we did in previous iterations of the loop here. Does that make sense?

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I don't think so, you can see the memory allocated for ca.cert.pem has been freed if it's found from the following snippet:

security_files_paths[i] = std::string(file_prefix + file_path);
free(file_path);

So even it fails to find cert.pem, it has nothing to do with ca.cert.pem, because they use their memory allocated respectively. right ?

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Yeah, you are correct. Sorry, I was thinking about it incorrectly. This part is fine.

return false;
}

security_files_paths[i] = std::string(file_prefix + file_path);
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Oh, also, I'm pretty sure file_prefix + file_path is wrong here. That's going to add two pointers, not concatenate the two of them together.

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exactly, the std::string should keep for file_path here

reorganize the code to make it more clear

Signed-off-by: Ethan Gao <ethan.gao@linux.intel.com>
@@ -168,14 +168,25 @@ get_security_file_paths(

const char * file_prefix = "file://";

std::string tmpstr;
char * file_path = nullptr;
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Could you not reduce the scope of the variable to within the for loop?

security_files_paths[i] = std::string(file_prefix + tmpstr);

if (rcutils_is_readable(file_path)) {
security_files_paths[i] = std::string(file_prefix + std::string(file_path));
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While this works, it is faster to make file_prefix above a std::string (like std::string file_prefix("file://");, and then here, do:

security_file_paths[i] = file_prefix + std::string(file_path);

Once we have that, and reduce the scope of the file_path like @wjwwood suggested, I think this will be ready to go.

gaoethan and others added 2 commits November 7, 2017 13:18
Also remove the error messages, since in the no-enforce case,
we don't want random error messages to appear.

Signed-off-by: Chris Lalancette <clalancette@openrobotics.org>
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I ended up pushing a few fixes to the code. In particular, my push did:

  1. Made file_prefix a std::string, getting rid of some copies in the loop
  2. Made the thing compile by doing a const_cast during the free
  3. Got rid of all of the RMW_SET_ERROR. The reason for this is a bit subtle. If get_security_file_paths fails, then iff security_options->enforce_security is true, we want to send an error. However, rmw_create_node (the caller of get_security_file_paths) already sets an error message, so setting it in get_security_file_paths is unnecessary work. In the case where security_options->enforce_security is false, we don't want to send any errors out of rmw_create_node (at least, not for this reason). Therefore, I think it is probably inappropriate to set errors down in get_security_file_paths at all.

I'm going to run CI on this now. @wjwwood , if you have a minute to review my work on top of Ethan's, that would be appreciated.

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clalancette commented Nov 7, 2017

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for (size_t i = 0; i < num_files; i++) {
tmpstr = std::string(rcutils_join_path(node_secure_root, file_names[i]));
if (!rcutils_is_readable(tmpstr.c_str())) {
const char * file_path = rcutils_join_path(node_secure_root, file_names[i]);
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Really, rcutils_join_path should not return const char * but just char * instead of needing to const cast it to free the result...

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Yeah, I agree with that. I'll do a separate PR with that, since every place that uses it has to do the same thing.

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The CI test failures are because of the known flake8 problem, reported here: ros2/build_farmer#67. Otherwise, this is looking pretty good. I'm going to merge this up. Thanks for the work!

@clalancette clalancette merged commit 425914d into ros2:master Nov 7, 2017
@clalancette clalancette removed the in review Waiting for review (Kanban column) label Nov 7, 2017
timonegk pushed a commit to timonegk/ros-rolling-rmw-fastrtps-cpp-release that referenced this pull request May 21, 2022
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  * Temporary buffer remove (#207 <ros2/rmw_fastrtps#207>)
  * Validate the buffer_ of CustomServiceRequest object before using it to (#210 <ros2/rmw_fastrtps#210>)
  * update usage of rcutils_join_path() (#208 <ros2/rmw_fastrtps#208>)
  * Expose raw CDR stream for publish and subscribe (#186 <ros2/rmw_fastrtps#186>)
  * Remove topic partitions (#192 <ros2/rmw_fastrtps#192>)
  * Fix leak if client reponse is never taken (#201 <ros2/rmw_fastrtps#201>)
  * Revert "Export rmw_fastrtps_cpp target" (#200 <ros2/rmw_fastrtps#200>)
  * Support access control  (#197 <ros2/rmw_fastrtps#197>)
  * Export rmw_fastrtps_cpp target (#198 <ros2/rmw_fastrtps#198>)
  * Fix deserialization segfault in bionic. (#199 <ros2/rmw_fastrtps#199>)
  * Fix namespaces (#196 <ros2/rmw_fastrtps#196>)
  * Merge pull request #182 <ros2/rmw_fastrtps#182> from ros2/node_name_in_user_data
  * add participant listener
  * add node name to user data
  * change export order for static linking (#190 <ros2/rmw_fastrtps#190>)
  * update style (#189 <ros2/rmw_fastrtps#189>)
  * optimize timeout judgement according to different condition (#187 <ros2/rmw_fastrtps#187>)
  * use existing check_wait_set_for_data to avoid duplicated code (#185 <ros2/rmw_fastrtps#185>)
  * Enable logging level manipulation from rmw_fastrtps (#156 <ros2/rmw_fastrtps#156>)
  * Small performance improvements (#183 <ros2/rmw_fastrtps#183>)
  * Segmentation error to dereference nullptr (#180 <ros2/rmw_fastrtps#180>)
  * Contributors: Dirk Thomas, Ethan Gao, Guillaume Autran, Karsten Knese, Michael Carroll, MiguelCompany, Mikael Arguedas, Minggang Wang, Rohit Salem, Shane Loretz, Sriram Raghunathan, William Woodall, jwang11
.
ros-rolling-rmw-fastrtps-cpp (0.4.0-1jammy) jammy; urgency=high
.
  * Merge pull request #178 <ros2/rmw_fastrtps#178> from ros2/fix_wrong_count
  * Merge pull request #177 <ros2/rmw_fastrtps#177> from ros2/rename_group
  * Wait set two words (#175 <ros2/rmw_fastrtps#175>)
  * not exporting pthread manually (#174 <ros2/rmw_fastrtps#174>)
  * Merge pull request #169 <ros2/rmw_fastrtps#169> from ros2/rep149
  * Merge pull request #171 <ros2/rmw_fastrtps#171> from jwang11/master
  * rcutils_join_path returns a char * now. (#173 <ros2/rmw_fastrtps#173>)
  * memory leak issue (#172 <ros2/rmw_fastrtps#172>)
  * Unify and simplify de/serializeROSmessage processing
  * Avoid duplicated code in calculateMaxSerializedSize for array and normal member (#168 <ros2/rmw_fastrtps#168>)
  * Fix the issues to dereference to nullptr (#165 <ros2/rmw_fastrtps#165>)
  * Fix rmw_fastrtps dead code (#163 <ros2/rmw_fastrtps#163>)
  * Merge pull request #167 <ros2/rmw_fastrtps#167> from deng02/tune-count-pub-sub
  * Remove string allocation in the count of subscribers and publishers
  * use auto deduction and nullptr to keep coding style consistent (#162 <ros2/rmw_fastrtps#162>)
  * Merge pull request #164 <ros2/rmw_fastrtps#164> from dejanpan/master
  * Fix several parameter check issues in rmw_fastrtps_cpp apis
  * Remove unnecessary dependency on rosidl_generator_cpp (#161 <ros2/rmw_fastrtps#161>)
  * Move the hasData checks for non-blocking wait 'timeout' higher (#158 <ros2/rmw_fastrtps#158>)
  * Support loading default XML profile file (#153 <ros2/rmw_fastrtps#153>)
  * Drop duplicated rmw_init.cpp in rmw_fastrtps_cpp/CMakeLists.txt (#155 <ros2/rmw_fastrtps#155>)
  * Merge pull request #154 <ros2/rmw_fastrtps#154> from ros2/uncrustify_master
  * Removing magic numbers: old maximun lengths (#152 <ros2/rmw_fastrtps#152>)
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3 participants