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CVE-2022-49569

Estado: ModificadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

spi: bcm2835: bcm2835_spi_handle_err(): fix NULL pointer deref for non DMA transfers

In case a IRQ based transfer times out the bcm2835_spi_handle_err() function is called. Since commit 1513ceee70f2 ("spi: bcm2835: Drop dma_pending flag") the TX and RX DMA transfers are unconditionally canceled, leading to NULL pointer derefs if ctlr->dma_tx or ctlr->dma_rx are not set.

Fix the NULL pointer deref by checking that ctlr->dma_tx and ctlr->dma_rx are valid pointers before accessing them.

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nspi: bcm2835: bcm2835_spi_handle_err(): fix NULL pointer deref for non DMA transfers\n\nIn case a IRQ based transfer times out the bcm2835_spi_handle_err()\nfunction is called. Since commit 1513ceee70f2 (\"spi: bcm2835: Drop\ndma_pending flag\") the TX and RX DMA transfers are unconditionally\ncanceled, leading to NULL pointer derefs if ctlr->dma_tx or\nctlr->dma_rx are not set.\n\nFix the NULL pointer deref by checking that ctlr->dma_tx and\nctlr->dma_rx are valid pointers before accessing them."
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      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: spi: bcm2835: bcm2835_spi_handle_err(): corrige la desreferencia del puntero NULL para transferencias que no sean DMA En caso de que se agote el tiempo de espera de una transferencia basada en IRQ, se llama a la función bcm2835_spi_handle_err(). Desde el commit 1513ceee70f2 (\"spi: bcm2835: Drop dma_pending flag\") las transferencias DMA TX y RX se cancelan incondicionalmente, lo que lleva a desreferencias del puntero NULL si no se configuran ctlr->dma_tx o ctlr->dma_rx. Corrija la desreferencia del puntero NULL comprobando que ctlr->dma_tx y ctlr->dma_rx sean punteros válidos antes de acceder a ellos."
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