CVE-2026-97502mmc: davinci: avoid NULL deref of host->data in IRQ handler

Official description

In the Linux kernel, the following vulnerability has been resolved: mmc: davinci: avoid NULL deref of host->data in IRQ handler mmc_davinci_irq() returns early only when both host->cmd and host->data are NULL: if (host->cmd == NULL && host->data == NULL) { ... return IRQ_NONE; } So we may legitimately reach the rest of the handler with host->data == NULL (and therefore data == NULL). The DATDNE branch already guards against this with an explicit "if (data != NULL)" check, but the subsequent TOUTRD ("read data timeout") and CRCWR/CRCRD ("data CRC error") branches dereference data unconditionally: if (qstatus & MMCST0_TOUTRD) { data->error = -ETIMEDOUT; <-- NULL deref ... davinci_abort_data(host, data); } if (qstatus & (MMCST0_CRCWR | MMCST0_CRCRD)) { data->error = -EILSEQ; <-- NULL deref ... } If either bit is set in qstatus while host->data is NULL, the kernel will crash inside the IRQ handler. smatch flags this: drivers/mmc/host/davinci_mmc.c:933 mmc_davinci_irq() error: we previously assumed 'data' could be null (see line 914) Gate both branches on a non-NULL data, matching the existing pattern used by the DATDNE branch. No functional change for callers where data is non-NULL, which is the only case in which these branches did meaningful work before this change.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96
• https://git.kernel.org/stable/c/f216cf00e829895ff49bdf695c944915e59bd698
• https://git.kernel.org/stable/c/a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319
• https://git.kernel.org/stable/c/3c5e3e5badbf0592332887d12db02458323682c3
• https://git.kernel.org/stable/c/a01cedf230dc0fcd55b994f5e548d3982ba4c732
• https://git.kernel.org/stable/c/5b7e151fe9ea9311ba601849aaecdc4fc97fd577
• https://git.kernel.org/stable/c/4f28846aaf8db9668e338b8987973f8935edff34