UBUNTU-CVE-2021-47542
In the Linux kernel, the following vulnerability has been resolved: net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings() In qlcnic_83xx_add_rings(), the indirect function of ahw->hw_ops->alloc_mbx_args will be called to allocate memory for cmd.req.arg, and there is a dereference of it in qlcnic_83xx_add_rings(), which could lead to a NULL pointer dereference on failure of the indirect function like qlcnic_83xx_alloc_mbx_args(). Fix this bug by adding a check of alloc_mbx_args(), this patch imitates the logic of mbx_cmd()'s failure handling. 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_QLCNIC=m show no new warnings, and our static analyzer no longer warns about this code.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
12 explicit affected versions
6 explicit affected versions
13 explicit affected versions
191 explicit affected versions
7 explicit affected versions
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39 explicit affected versions
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29 explicit affected versions
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13 explicit affected versions
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99 explicit affected versions
1 explicit affected versions
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1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
12 explicit affected versions
1 explicit affected versions
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12 explicit affected versions
43 explicit affected versions
3 explicit affected versions
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12 explicit affected versions
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1 explicit affected versions
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33 explicit affected versions
23 explicit affected versions
10 explicit affected versions
55 explicit affected versions
11 explicit affected versions
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78 explicit affected versions
7 explicit affected versions
12 explicit affected versions
42 explicit affected versions
2 explicit affected versions
39 explicit affected versions
10 explicit affected versions
26 explicit affected versions
13 explicit affected versions
16 explicit affected versions
3 explicit affected versions
1 explicit affected versions
10 explicit affected versions
51 explicit affected versions
32 explicit affected versions
12 explicit affected versions
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1 explicit affected versions
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36 explicit affected versions
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33 explicit affected versions
8 explicit affected versions
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32 explicit affected versions
10 explicit affected versions
13 explicit affected versions
1 explicit affected versions
7 explicit affected versions
32 explicit affected versions
10 explicit affected versions
12 explicit affected versions
29 explicit affected versions
44 explicit affected versions
16 explicit affected versions
3 explicit affected versions
13 explicit affected versions
26 explicit affected versions
37 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
142 explicit affected versions
32 explicit affected versions
7 explicit affected versions
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12 explicit affected versions
86 explicit affected versions
63 explicit affected versions
4 explicit affected versions
54 explicit affected versions
32 explicit affected versions
43 explicit affected versions
1 explicit affected versions
122 explicit affected versions
103 explicit affected versions
10 explicit affected versions
8 explicit affected versions
14 explicit affected versions
33 explicit affected versions
4 explicit affected versions
21 explicit affected versions
1 explicit affected versions
10 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
In the Linux kernel, the following vulnerability has been resolved: net: qlogic: qlcnic: Fix a NULL pointer dereference in qlcnic_83xx_add_rings() In qlcnic_83xx_add_rings(), the indirect function of ahw->hw_ops->alloc_mbx_args will be called to allocate memory for cmd.req.arg, and there is a dereference of it in qlcnic_83xx_add_rings(), which could lead to a NULL pointer dereference on failure of the indirect function like qlcnic_83xx_alloc_mbx_args(). Fix this bug by adding a check of alloc_mbx_args(), this patch imitates the logic of mbx_cmd()'s failure handling. 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_QLCNIC=m show no new warnings, and our static analyzer no longer warns about this code.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572
- https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105
- https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03
- https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45
- https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf
- https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073
- https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f
- https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853
- https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572
- https://ubuntu.com/security/CVE-2021-47542
- https://ubuntu.com/security/notices/USN-6976-1
- https://www.cve.org/CVERecord?id=CVE-2021-47542