5.5

CVE-2021-4441

spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()

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

spi: spi-zynq-qspi: Fix a NULL pointer dereference in zynq_qspi_exec_mem_op()

In zynq_qspi_exec_mem_op(), kzalloc() is directly used in memset(),
which could lead to a NULL pointer dereference on failure of
kzalloc().

Fix this bug by adding a check of tmpbuf.

This bug was found by a static analyzer. The analysis employs
differential checking to identify inconsistent security operations
(e.g., checks or kfrees) between two code paths and confirms that the
inconsistent operations are not recovered in the current function or
the callers, so they constitute bugs.

Note that, as a bug found by static analysis, it can be a false
positive or hard to trigger. Multiple researchers have cross-reviewed
the bug.

Builds with CONFIG_SPI_ZYNQ_QSPI=m show no new warnings,
and our static analyzer no longer warns about this code.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 5.2 < 5.4.182
Linux ≫ Linux Kernel Version >= 5.5 < 5.10.103
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.26
Linux ≫ Linux Kernel Version >= 5.16 < 5.16.12
Linux ≫ Linux Kernel Version5.17 Updaterc1
Linux ≫ Linux Kernel Version5.17 Updaterc2
Linux ≫ Linux Kernel Version5.17 Updaterc3
Linux ≫ Linux Kernel Version5.17 Updaterc4
Linux ≫ Linux Kernel Version5.17 Updaterc5
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Zu dieser CVE wurde keine Warnung gefunden.
EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.23% 0.129
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-476 NULL Pointer Dereference

The product dereferences a pointer that it expects to be valid but is NULL.

https://git.kernel.org/stable/c/2efece1368aeee2d2552c7ec36aeb676c4d4c95f
Patch
https://git.kernel.org/stable/c/3c32405d6474a21f7d742828e73c13e326dcae82
Patch
https://git.kernel.org/stable/c/ab3824427b848da10e9fe2727f035bbeecae6ff4
Patch
https://git.kernel.org/stable/c/b9dd08cbebe0c593c49bf86d2012a431494e54cb
Patch
https://git.kernel.org/stable/c/df14d2bed8e2455878e046e67123d9ecb2e79056
Patch