Fix shift-out-of-bounds in xprt_calc_majortimeo(). UBSAN: shift-out-of-bounds in net/sunrpc/xprt.c:658:14 shift exponent 536871232 is too large for 64-bit type 'long u Reported-by: syzbot+ba2e91df8f74809417fa@xxxxxxxxxxxxxxxxxxxxxxxxx Signed-off-by: Kurt Manucredo <fuzzybritches0@xxxxxxxxx> --- net/sunrpc/xprt.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/net/sunrpc/xprt.c b/net/sunrpc/xprt.c index 691ccf8049a4..07128ac3d51d 100644 --- a/net/sunrpc/xprt.c +++ b/net/sunrpc/xprt.c @@ -655,7 +655,10 @@ static unsigned long xprt_calc_majortimeo(struct rpc_rqst *req) unsigned long majortimeo = req->rq_timeout; if (to->to_exponential) - majortimeo <<= to->to_retries; + if (to->to_retries >= sizeof(majortimeo) * 8) + majortimeo = to->to_maxval; + else + majortimeo <<= to->to_retries; else majortimeo += to->to_increment * to->to_retries; if (majortimeo > to->to_maxval || majortimeo == 0) -- 2.30.2
