fix(zpool): Integer overflow in zpool parser.

Closes issue #88

src/parsers/mod.rs

@@ -448,4 +448,13 @@ errors: No known data errors
 
         assert_eq!(&topo, &zpool);
     }
+
+    #[test]
+    fn test_zpool_int_overflow() {
+        let stdout = include_str!("fixtures/SIGABRT.PID.84191.TIME.2019-08-21.20.04.09.fuzz");
+        let mut pairs =
+            StdoutParser::parse(Rule::zpools, stdout).unwrap_or_else(|e| panic!("{}", e));
+        let pair = pairs.next().unwrap();
+        let zpool = Zpool::from_pest_pair(pair);
+    }
 }

src/zpool/description.rs

@@ -124,9 +124,9 @@ fn get_error_statistics_from_pair(pair: Pair<'_, Rule>) -> ErrorStatistics {
     debug_assert_eq!(Rule::error_statistics, pair.as_rule());
     let mut inner = pair.into_inner();
     ErrorStatistics {
-        read:     inner.next().unwrap().as_span().as_str().parse().unwrap(),
-        write:    inner.next().unwrap().as_span().as_str().parse().unwrap(),
-        checksum: inner.next().unwrap().as_span().as_str().parse().unwrap(),
+        read:     inner.next().unwrap().as_span().as_str().parse().unwrap_or(std::u64::MAX),
+        write:    inner.next().unwrap().as_span().as_str().parse().unwrap_or(std::u64::MAX),
+        checksum: inner.next().unwrap().as_span().as_str().parse().unwrap_or(std::u64::MAX),
     }
 }
 

src/zpool/vdev.rs

@@ -32,13 +32,15 @@ use std::{default::Default,
 use crate::zpool::{Health, Reason, ZpoolError};
 
 /// Error statistics.
+///
+/// NOTE: Due to imperfections of our world number of errors limited to [`std::u64::MAX`](https://doc.rust-lang.org/std/u64/constant.MAX.html).
 #[derive(Debug, Clone, Eq, PartialEq)]
 pub struct ErrorStatistics {
     /// I/O errors that occurred while issuing a read request
     pub read: u64,
     /// I/O errors that occurred while issuing a write request
     pub write: u64,
-    /// Checksum errors, meaning that the device returned corrupted data as the
+    /// Checksum errors, meaning the device returned corrupted data as the
     /// result of a read request
     pub checksum: u64,
 }