fix(mdns): Fix potential mem issue with scheduled packets#920
Open
david-cermak wants to merge 2 commits intoespressif:masterfrom
Open
fix(mdns): Fix potential mem issue with scheduled packets#920david-cermak wants to merge 2 commits intoespressif:masterfrom
david-cermak wants to merge 2 commits intoespressif:masterfrom
Conversation
![cursor[bot]](https://avatars.githubusercontent.com/in/1210556?s=60&v=4){kind=small}
This comment was marked as outdated.
This comment was marked as outdated.
Sorry, something went wrong.
This comment was marked as outdated.
This comment was marked as outdated.
Sorry, something went wrong.
david-cermak
force-pushed
the
fix/mdns_leak
branch
from
d9cd87b to
fc3f21a
Compare
This comment was marked as outdated.
This comment was marked as outdated.
Sorry, something went wrong.
david-cermak
force-pushed
the
fix/mdns_leak
branch
from
fc3f21a to
a8e1acb
Compare
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
Learn more about bidirectional Unicode characters
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
1 participant
Add this suggestion to a batch that can be applied as a single commit.This suggestion is invalid because no changes were made to the code.Suggestions cannot be applied while the pull request is closed.Suggestions cannot be applied while viewing a subset of changes.Only one suggestion per line can be applied in a batch.Add this suggestion to a batch that can be applied as a single commit.Applying suggestions on deleted lines is not supported.You must change the existing code in this line in order to create a valid suggestion.Outdated suggestions cannot be applied.This suggestion has been applied or marked resolved.Suggestions cannot be applied from pending reviews.Suggestions cannot be applied on multi-line comments.Suggestions cannot be applied while the pull request is queued to merge.Suggestion cannot be applied right now. Please check back later.
Closes #917
Fixes memory leaks and use-after-free in mDNS question handling by ensuring dynamically allocated strings are freed when questions are discarded early.
Changes:
Stop freeing domain: q->domain points to MDNS_DEFAULT_DOMAIN, so it is not freed.
Switch to dynamic allocations in (Allocate host, service, and proto with mdns_mem_strndup() and set own_dynamic_memory = true)
Add cleanup in early discard paths:
Prevents leaks when questions are discarded before being queued (duplicates, NULL values, or early removal). Ensures consistency with the own_dynamic_memory flag and avoids accessing freed memory.
This aligns with the pattern used in
_mdns_free_tx_packet()for cleaning up dynamically allocated question fields.