CVE-2021-47541

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.