[PATCH 0/2][Bionic/Groovy] CVE-2021-29264: gianfar negative fragment size

[Tim Gardner]

[SRU Justification]

An issue was discovered in the Linux kernel through 5.11.10.
drivers/net/ethernet/freescale/gianfar.c in the Freescale Gianfar Ethernet
driver allows attackers to cause a system crash because a negative fragment size
is calculated in situations involving an rx queue overrun when jumbo packets are
used and NAPI is enabled, aka CID-d8861bab48b6.

Introduced by 6c389fc931bcda88940c809f752ada6d7799482c (v4.8)

[Test Plan]

[Where problems could occur]
Released in stable kernels:
linux-4.19.y
linux-5.10.y
linux-5.11.y
linux-5.4.y

[Other Info]
None