Wind River Support Network

Description

In the Linux kernel, the following vulnerability has been resolved:  net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()  m2sm() converts a u32 slope to a u64 scaled value.  For large inputs (e.g. m1=4000000000), the result can reach 2^32.  rtsc_min() stores the difference of two such u64 values in a u32 variable `dsm` and uses it as a divisor.  When the difference is exactly 2^32 the truncation yields zero, causing a divide-by-zero oops in the concave-curve intersection path:    Oops: divide error: 0000   RIP: 0010:rtsc_min (net/sched/sch_hfsc.c:601)   Call Trace:    init_ed (net/sched/sch_hfsc.c:629)    hfsc_enqueue (net/sched/sch_hfsc.c:1569)    [...]  Widen `dsm` to u64 and replace do_div() with div64_u64() so the full difference is preserved.