[Git][wine/wine][master] crypt32: Don't release context in CSignedEncodeMsg_Open.

[Alexandre Julliard (＠julliard)]

Alexandre Julliard pushed to branch master at wine / wine

Commits:
18f55c30 by Yuxuan Shui at 2025-06-25T12:17:27+02:00
crypt32: Don't release context in CSignedEncodeMsg_Open.

The docs say it should be released in the last CryptMsgUpdate, but tests show
it's actually released in CryptMsgClose. So let's do the same.

This solve a use-after-free issue for signed messages, because they contains
HCRYPTHASH objects which references the context internally, and will use it
in CryptDestroyHash. If the context is released in CSignedEncodeMsg_Open, this
will be a use-after-free.

- - - - -

2 changed files:

- dlls/crypt32/msg.c
- dlls/crypt32/tests/msg.c

View it on GitLab: https://gitlab.winehq.org/wine/wine/-/commit/18f55c306e59ef21701f16463db68c6...