CVE ID:	CVE-2021-47541
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.
Test IDs:	None available
Cross References:	Common Vulnerability Exposure (CVE) ID: CVE-2021-47541 https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275 https://git.kernel.org/stable/c/676dc7d9b15bf8733233a2db1ec3f9091ab34275 https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18 https://git.kernel.org/stable/c/75917372eef0dbfb290ae45474314d35f97aea18 https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570 https://git.kernel.org/stable/c/addad7643142f500080417dd7272f49b7a185570 https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757 https://git.kernel.org/stable/c/be12572c5ddc8ad7453bada4eec8fa46967dc757 https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68 https://git.kernel.org/stable/c/e461a9816a1ac5b4aeb61621b817225b61e46a68 https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b https://git.kernel.org/stable/c/f1d43efa59f1edd3e7eca0e94559b4c6b1cd4e2b