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train : fix #4227 (double free in examples/train-text-from-scratch/train-text-from-scratch.cpp) (#4351)

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On commit b1108 (44c117f4) xaedes added

    ggml_allocr * alloc = NULL;

    ... (many lines in between)

    if (alloc) {
        ggml_allocr_free(alloc);
    }

Which is correct, but it's easy to lose context after many lines in between.

On commit b1287 (0e76a899) xaedes made a big change. From here on, alloc is freed eagerly.

    alloc = ggml_allocr_new(...)
    ... (short lines of code)
    ggml_allocr_free(alloc)

This happens a few times, but alloc is never set to NULL, and many lines below,
we still have

    if (alloc) {
        ggml_allocr_free(alloc);
    }

which causes a double-free.
This commit is contained in:
Hongyu Ouyang 2023-12-07 02:25:22 -08:00 committed by GitHub
parent 05cd6e5036
commit 81bc9214a3
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1 changed files with 0 additions and 4 deletions
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4
examples/train-text-from-scratch/train-text-from-scratch.cpp
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@ -1295,10 +1295,6 @@ int main(int argc, char ** argv) {
opt_cb_data.last_save_iter = opt->iter;
}
if (alloc) {
ggml_allocr_free(alloc);
}
ggml_free(opt->ctx);
free_train_state(train);
ggml_free(model.ctx);