dm-stats: fix a crash if allocation of per-cpu data fails
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.2%
exploitation probability
0.2%top 93% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
dm-stats: fix a crash if allocation of per-cpu data fails
If "dm_kvzalloc(percpu_alloc_size, cpu_to_node(cpu))" fails, the code
jumps to the "out" label and calls dm_stat_free. dm_stat_free does
"for_each_possible_cpu(cpu) { dm_kvfree(s->stat_percpu[cpu][0].histogram,
s->histogram_alloc_size);", which crashes with NULL pointer dereference
if s->stat_percpu[cpu] is NULL.
This commit fixes the bug by testing s->stat_percpu[cpu] for NULL before
using it.
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/0c8f7870ed3ebd512f090d7714cc2c556b9e5c75https://git.kernel.org/stable/c/389a50d094e13724f5f45e6d9d6ef734c98ba291https://git.kernel.org/stable/c/564d17573ef643c13cf6e9015124a205fa65e704https://git.kernel.org/stable/c/74210fa072960a18bb0eead487585452af722e4fhttps://git.kernel.org/stable/c/9805d87d0e26c68ee69da3928e665214d2e2851ahttps://git.kernel.org/stable/c/c3f211b7a277dd404b4e7d23095be964b5b46a27https://git.kernel.org/stable/c/cc87e26d9cce22061dc21e51e11afef29dbbc36ahttps://git.kernel.org/stable/c/e45f0b0c41139810ff395ba2f3cfca1460a5b8a6