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fix(terminal): coverity USE_AFTER_FREE #18978

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Problem:
Coverity reports use after free:

    *** CID 352784:  Memory - illegal accesses  (USE_AFTER_FREE)
    /src/nvim/buffer.c: 1508 in set_curbuf()
    1502         if (old_tw != curbuf->b_p_tw) {
    1503           check_colorcolumn(curwin);
    1504         }
    1505       }
    1506
    1507       if (bufref_valid(&prevbufref) && prevbuf->terminal != NULL) {
    >>>     CID 352784:  Memory - illegal accesses  (USE_AFTER_FREE)
    >>>     Calling "terminal_check_size" dereferences freed pointer "prevbuf->terminal".
    1508         terminal_check_size(prevbuf->terminal);
    1509       }
    1510     }
    1511
    1512     /// Enter a new current buffer.
    1513     /// Old curbuf must have been abandoned already!  This also means "curbuf" may

Solution:
Change terminal_destroy and terminal_close to set caller storage to NULL,
similar to XFREE_CLEAR. This aligns with the pattern found already in:
terminal_destroy e897ccad3e
term_delayed_free 3e59c1e20d
This commit is contained in:
Justin M. Keyes
2022-06-18 18:53:12 +02:00
committed by GitHub
parent 9c0f2253a5
commit ff6b8f5435
4 changed files with 18 additions and 10 deletions
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3
src/nvim/api/vim.c
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@@ -1025,8 +1025,7 @@ static void term_resize(uint16_t width, uint16_t height, void *data)
static void term_close(void *data)
{
Channel *chan = data;
terminal_destroy(chan->term);
chan->term = NULL;
terminal_destroy(&chan->term);
api_free_luaref(chan->stream.internal.cb);
chan->stream.internal.cb = LUA_NOREF;
channel_decref(chan);