Description: memory leak in the kernel_read_file function in fs/exec.c
References:
 https://lore.kernel.org/lkml/20190219021038.11340-1-yuehaibing@huawei.com/
 https://lore.kernel.org/lkml/20190219022512.GW2217@ZenIV.linux.org.uk/
Notes:
 carnil> Commit Fixes: 39d637af5aa7 ("vfs: forbid write access when
 carnil> reading a file into memory") which is in 4.7-rc1
Bugs:
upstream: released (5.1-rc1) [f612acfae86af7ecad754ae6a46019be9da05b8e]
4.19-upstream-stable: released (4.19.28) [b60d90b2d3d14c426693a0a34041db11be66d29e]
4.9-upstream-stable: released (4.9.163) [dd6734e17903f16a47c78d0418f02e06df080c54]
3.16-upstream-stable: N/A "Vulnerable code not present"
sid: released (4.19.28-1)
4.9-stretch-security: released (4.9.168-1)
3.16-jessie-security: N/A "Vulnerable code not present"