mirror of
https://git.tartarus.org/simon/putty.git
synced 2025-04-13 09:08:06 -05:00
65270b56f0
In a GUI app, when interactive userpass input begins, the Ldisc acquires a reference to a prompts_t. If something bad happens to the SSH connection (e.g. unexpected server-side closure), then all the SSH layers will be destroyed, including freeing that prompts_t. So the Ldisc will have a stale reference to it, which it might potentially use. To fix that, I've arranged a back-pointer so that prompts_t itself can find the Ldisc's reference to it, and NULL it out on free. So now, whichever of a prompts_t and an Ldisc is freed first, the link between them should be cleanly broken. (I'm not 100% sure this is absolutely necessary, in the sense of whether a sequence of events can _actually_ happen that causes a stale pointer dereference. But I don't want to take the chance!)
This is the README for PuTTY, a free Windows and Unix Telnet and SSH
client.
PuTTY is built using CMake <https://cmake.org/>. To compile in the
simplest way (on any of Linux, Windows or Mac), run these commands in
the source directory:
cmake .
cmake --build .
Documentation (in various formats including Windows Help and Unix
`man' pages) is built from the Halibut (`.but') files in the `doc'
subdirectory using `doc/Makefile'. If you aren't using one of our
source snapshots, you'll need to do this yourself. Halibut can be
found at <https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
The PuTTY home web site is
https://www.chiark.greenend.org.uk/~sgtatham/putty/
If you want to send bug reports or feature requests, please read the
Feedback section of the web site before doing so. Sending one-line
reports saying `it doesn't work' will waste your time as much as
ours.
See the file LICENCE for the licence conditions.