pidgin/pidgin

Fix leak in `purple_markup_find_tag` on error
release-2.x.y
2021-09-15, Elliott Sales de Andrade
addb2327cde0
Fix leak in `purple_markup_find_tag` on error

The output is set to `NULL`, but the internal data list is not freed if it happened to get something put into it.

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=35816

Testing Done:
Ran `pidgin_utils_fuzzer` on the test case in the bug report.

Reviewed at https://reviews.imfreedom.org/r/924/
# vi:et:ts=2 sw=2 sts=2
image: pidgin/builder-debian:buster
pipelines:
default:
- step:
script:
- set -ex
- meson -Dsilc=false -Ddoc=true -Ddebug=true build
- ninja -C build
- ninja -C build test
branches:
release-2.x.y:
- step:
image: pidgin/builders-2:debian-buster-amd64
script:
- set -ex
- hg clone https://bitbucket.org/pidgin/libgnt -b release-2.x.y
- meson -Dprefix=/usr libgnt libgnt/build
- ninja -C libgnt/build install
- ldconfig
- build.sh