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    SubjectRe: [PATCH v4 01/14] dmaengine: tegra-apb: Fix use-after-free
    Date

    On 12/01/2020 17:29, Dmitry Osipenko wrote:
    > I was doing some experiments with I2C and noticed that Tegra APB DMA
    > driver crashes sometime after I2C DMA transfer termination. The crash
    > happens because tegra_dma_terminate_all() bails out immediately if pending
    > list is empty, thus it doesn't release the half-completed descriptors
    > which are getting re-used before ISR tasklet kicks-in.

    Can you elaborate a bit more on how these are getting re-used? What is
    the sequence of events which results in the panic? I believe that this
    was also reported in the past [0] and so I don't doubt there is an issue
    here, but would like to completely understand this.

    Thanks!
    Jon

    [0] https://lore.kernel.org/patchwork/patch/675349/

    --
    nvpublic

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