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[varint] Tighten max input bounds.

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This commit is contained in:
Jeroen van Rijn
2022-03-08 19:56:42 +01:00
parent 26ffec845b
commit 2a41814985
1 changed files with 2 additions and 2 deletions
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core/encoding/varint/leb128.odin
+2 -2
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@@ -32,7 +32,7 @@ decode_uleb128 :: proc(buf: []u8) -> (val: u128, size: int, err: Error) {
size = i + 1 size = i + 1
// 18 * 7 bits = 126, which means that a possible 19th byte may at most be 0b0000_0011. // 18 * 7 bits = 126, which means that a possible 19th byte may at most be 0b0000_0011.
if size == LEB128_MAX_BYTES && v > 0b0000_0011 { if size > LEB128_MAX_BYTES || size == LEB128_MAX_BYTES && v > 0b0000_0011 {
return 0, 0, .Value_Too_Large return 0, 0, .Value_Too_Large
} }
@@ -64,7 +64,7 @@ decode_ileb128 :: proc(buf: []u8) -> (val: i128, size: int, err: Error) {
size += 1 size += 1
// 18 * 7 bits = 126, which including sign means we can have a 19th byte. // 18 * 7 bits = 126, which including sign means we can have a 19th byte.
if size == LEB128_MAX_BYTES && v > 0x7f { if size > LEB128_MAX_BYTES || size == LEB128_MAX_BYTES && v > 0x7f {
return 0, 0, .Value_Too_Large return 0, 0, .Value_Too_Large
} }