Description (CNA)
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 (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c before 51738de7dd5f8e8b33dfc07ef85bc06d3bf41e96; affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c before f216cf00e829895ff49bdf695c944915e59bd698; affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c before a0cde8d70d64c1a75fbd57f01d9f2d7cccac8319; affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c before 3c5e3e5badbf0592332887d12db02458323682c3; affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c before a01cedf230dc0fcd55b994f5e548d3982ba4c732; affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c before 5b7e151fe9ea9311ba601849aaecdc4fc97fd577; affected b4cff4549b7a8c5fc8b88e3493b6287555f0512c before 4f28846aaf8db9668e338b8987973f8935edff34 |
| Linux / Linux | affected 2.6.33; unaffected 0 before 2.6.33; unaffected 5.10.271 through 5.10.*; unaffected 5.15.222 through 5.15.*; unaffected 6.1.189 through 6.1.*; unaffected 6.6.158 through 6.6.*; unaffected 6.12.111 through 6.12.*; unaffected 6.18.53 through 6.18.*; unaffected 7.2 through * |
CWE
No CWE identifiers supplied.
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