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time: panic in LoadLocationFromTZData with malformed data #29437

josharian opened this issue Dec 28, 2018 · 1 comment


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commented Dec 28, 2018

package main

import "time"

func main() {
	tzdata := "TZif\x00000000000000000\x00\x00\x00\x01\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x00\x0000"
	time.LoadLocationFromTZData("abc", []byte(tzdata))


panic: runtime error: index out of range

goroutine 1 [running]:
time.LoadLocationFromTZData(0x1074f08, 0x3, 0xc00007c030, 0x2e, 0x30, 0x30, 0xc000072058, 0x0)
	/Users/josh/go/tip/src/time/zoneinfo_read.go:226 +0xf09
	/Users/josh/go/tip/src/x.go:7 +0x77
exit status 2


Found with go-fuzz.

cc @dvyukov


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commented Dec 28, 2018

Change mentions this issue: time: reject tzdata with no zones

@josharian josharian removed the help wanted label Dec 28, 2018

@josharian josharian added this to the Go1.13 milestone Dec 28, 2018

josharian added a commit to josharian/go that referenced this issue Dec 30, 2018

time: reject tzdata with no zones
Fixes golang#29437

Change-Id: Ice0a03a543e564d66651bfdfce5cd32ebaa35926

@gopherbot gopherbot closed this in 58bf401 Feb 27, 2019

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