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Fix a panic with an invalid name section #3509

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Nov 5, 2021
Merged

Fix a panic with an invalid name section #3509

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10 changes: 10 additions & 0 deletions crates/environ/src/module_environ.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -1277,6 +1277,11 @@ and for re-adding support for interface types you can see this issue:
let mut names = f.get_map()?;
for _ in 0..names.get_count() {
let Naming { index, name } = names.read()?;
// Skip this naming if it's naming a function that
// doesn't actually exist.
if (index as usize) >= self.result.module.functions.len() {
continue;
}
let index = FuncIndex::from_u32(index);
self.result
.module
Expand Down Expand Up @@ -1305,6 +1310,11 @@ and for re-adding support for interface types you can see this issue:
let mut reader = l.get_indirect_map()?;
for _ in 0..reader.get_indirect_count() {
let f = reader.read()?;
// Skip this naming if it's naming a function that
// doesn't actually exist.
if (f.indirect_index as usize) >= self.result.module.functions.len() {
continue;
}
let mut map = f.get_map()?;
for _ in 0..map.get_count() {
let Naming { index, name } = map.read()?;
Expand Down
43 changes: 43 additions & 0 deletions tests/misc_testsuite/empty.wast
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Original file line number Diff line number Diff line change
@@ -1,3 +1,46 @@
(module (func (export "empty")))

(invoke "empty")

(module binary
"\00asm\01\00\00\00" ;; module header

"\00" ;; custom section id 0
"\0e" ;; section size
"\04name" ;; this is the `name` custom section
"\01" ;; function name subsection
"\07" ;; function name subsection size
"\01" ;; 1 function name mapping
"\ff\ff\ff\ff\0f" ;; index == u32::MAX
"\00" ;; empty string name
)

(module binary
"\00asm\01\00\00\00" ;; module header

"\00" ;; custom section id 0
"\10" ;; section size
"\04name" ;; this is the `name` custom section
"\02" ;; local name subsection
"\09" ;; local name subsection size
"\01" ;; 1 indirect name map
"\ff\ff\ff\ff\0f" ;; index == u32::MAX (function)
"\01" ;; 1 name mapping
"\00" ;; index == 0 (local)
"\00" ;; empty string name
)

(module binary
"\00asm\01\00\00\00" ;; module header

"\00" ;; custom section id 0
"\10" ;; section size
"\04name" ;; this is the `name` custom section
"\02" ;; local name subsection
"\09" ;; local name subsection size
"\01" ;; 1 indirect name map
"\00" ;; index == 0 (function)
"\01" ;; 1 name mapping
"\ff\ff\ff\ff\0f" ;; index == u32::MAX (local)
"\00" ;; empty string name
)