Fix some empty vector references #10250

1. 
   sipa commented at 1:01 pm on April 21, 2017: member

   streams.h has some methods that can be tricked into dereferencing null pointers or end() iterators. Fix this. This problem does not manifest in practice (yet), it seems.

   Discovered by @theuni.

2. Fix some empty vector references

   streams.h has some methods that can be tricked into dereferencing
   null pointers or end() iterators. Fix this.

   f478d98fe4
3. 
   laanwj commented at 1:50 pm on April 21, 2017: member

   utACK https://github.com/bitcoin/bitcoin/pull/10250/commits/f478d98fe49d3c0c0f2c79b3f8d9dbfc1aafd407
4. laanwj added the label Utils and libraries on Apr 21, 2017
5. 
   theuni commented at 2:01 pm on April 21, 2017: member

   utACK f478d98fe49d3c0c0f2c79b3f8d9dbfc1aafd407
6. 
   paveljanik commented at 2:02 pm on April 21, 2017: contributor

   utACK f478d98
7. laanwj merged this on Apr 21, 2017
8. laanwj closed this on Apr 21, 2017

   ---

9. laanwj referenced this in commit 1428f3030d on Apr 21, 2017
10. 
    jtimon commented at 7:53 pm on April 24, 2017: contributor

    post-merge utACK f478d98fe49d3c0c0f2c79b3f8d9dbfc1aafd407
11. luke-jr referenced this in commit dbfb1f3540 on Jun 3, 2017
12. luke-jr referenced this in commit 2b1608b243 on Jun 3, 2017
13. luke-jr referenced this in commit bc516945d3 on Jun 3, 2017
14. luke-jr referenced this in commit ef924c53d9 on Jun 5, 2017
15. luke-jr referenced this in commit 69fda1bfd0 on Jun 5, 2017
16. luke-jr referenced this in commit e23cef0c94 on Jun 5, 2017
17. sipa deleted the branch on Jun 23, 2017
18. nomnombtc referenced this in commit bd52b4d922 on Jul 17, 2017
19. codablock referenced this in commit 6cf97b5ba5 on Oct 31, 2017
20. codablock referenced this in commit 8ed6722196 on Oct 31, 2017
21. UdjinM6 referenced this in commit b22c2b23b2 on Nov 8, 2017
22. zkbot referenced this in commit 702a495a01 on Apr 19, 2018
23. zkbot referenced this in commit 30b31ea5f6 on Apr 21, 2018
24. zkbot referenced this in commit c62365186c on Apr 30, 2018
25. zkbot referenced this in commit 2d1a3cf8f5 on May 3, 2018
26. random-zebra referenced this in commit afafd7f6a9 on Aug 12, 2020
27. MarcoFalke locked this on Sep 8, 2021

Contributors
sipa laanwj theuni paveljanik jtimon

Labels
Utils/log/libs