Random AV at client application using events when connection was broken [CORE5530]

[firebird-automations]

Submitted by: @hvlad

If client application
- uses local (stack based) status vector when call ISC API functions, and
- uses events, and
- connection with server is broken,
then random AV could happens in some of application thread's.

The reason is that fbclient saves pointer to the user status-vector at entry to the
all ISC API functions and later report network error happens at event listener thread
using that saved pointer to the status-vector. If stack variable is out of scope it
means events listener thread wrote to the some "random" place at the stack of
another thread.

Commits: 817919c

[firebird-automations]

Modified by: @hvlad

assignee: Vlad Khorsun [ hvlad ]

[firebird-automations]

Commented by: @hvlad

Code in v3 (and v4) is heavy refactored and it looks like it have no such problem

[firebird-automations]

Modified by: @hvlad

status: Open [ 1 ] => Resolved [ 5 ]

resolution: Fixed [ 1 ]

[firebird-automations]

Modified by: @hvlad

Fix Version: 2.5.8 [ 10809 ]