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PUBLISHED

CVE-2021-47541

net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources()

Reserved:2024-05-24
Published:2024-05-24
Updated:2024-06-10

Description

In the Linux kernel, the following vulnerability has been resolved: net/mlx4_en: Fix an use-after-free bug in mlx4_en_try_alloc_resources() In mlx4_en_try_alloc_resources(), mlx4_en_copy_priv() is called and tmp->tx_cq will be freed on the error path of mlx4_en_copy_priv(). After that mlx4_en_alloc_resources() is called and there is a dereference of &tmp->tx_cq[t][i] in mlx4_en_alloc_resources(), which could lead to a use after free problem on failure of mlx4_en_copy_priv(). Fix this bug by adding a check of mlx4_en_copy_priv() 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_MLX4_EN=m show no new warnings, and our static analyzer no longer warns about this code.

Product status

Default status
unaffected

ec25bc04ed8e before be12572c5ddc
affected

ec25bc04ed8e before 676dc7d9b15b
affected

ec25bc04ed8e before e461a9816a1a
affected

ec25bc04ed8e before f1d43efa59f1
affected

ec25bc04ed8e before 75917372eef0
affected

ec25bc04ed8e before addad7643142
affected

Default status
affected

4.7
affected

Any version before 4.7
unaffected

4.14.257
unaffected

4.19.220
unaffected

5.4.164
unaffected

5.10.84
unaffected

5.15.7
unaffected

5.16
unaffected

References

https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757

https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275

https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68

https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b

https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18

https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570

cve.org CVE-2021-47541

nvd.nist.gov CVE-2021-47541

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