CVE ID:	CVE-2021-47542
Description:	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.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-47542 https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 https://git.kernel.org/stable/c/15fa12c119f869173f9b710cbe6a4a14071d2105 https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 https://git.kernel.org/stable/c/3a061d54e260b701b538873b43e399d9b8b83e03 https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 https://git.kernel.org/stable/c/550658a2d61e4eaf522c8ebc7fad76dc376bfb45 https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf https://git.kernel.org/stable/c/57af54a56024435d83e44c78449513b414eb6edf https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 https://git.kernel.org/stable/c/b4f217d6fcc00c3fdc0921a7691f30be7490b073 https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f https://git.kernel.org/stable/c/bbeb0325a7460ebf1e03f5e0bfc5c652fba9519f https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 https://git.kernel.org/stable/c/c5ef33c1489b2cd74368057fa00b5d2183bb5853 https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572 https://git.kernel.org/stable/c/e2dabc4f7e7b60299c20a36d6a7b24ed9bf8e572