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Don't abort for overlay large sixel payloads

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Rust hasn't stabilized fallible allocation, so when we are presented
with an implausibly large sixel, Rust terminates the program; it's not
even a panick that we could potentially catch -> direct to termination.

This commit introduces an arbitrary constraint so that we can
avoid unconditionally terminating for this bad input case.

Thanks to @klamonte for sharing this test case!
This commit is contained in:
Wez Furlong 2021-06-19 13:01:17 -07:00
parent d57bc9b3dc
commit d317f0f312
1 changed files with 19 additions and 1 deletions
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20
termwiz/src/escape/parser/mod.rs
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@ -338,7 +338,25 @@ impl SixelBuilder {
self.sixel.pixel_height = pixel_height;
if let (Some(w), Some(h)) = (pixel_width, pixel_height) {
self.sixel.data.reserve(w as usize * h as usize);
let size = w as usize * h as usize;
// Ideally we'd just use `try_reserve` here, but that is
// nightly Rust only at the time of writing this comment:
// <https://github.com/rust-lang/rust/issues/48043>
const MAX_SIXEL_SIZE: usize = 100_000_000;
if size > MAX_SIXEL_SIZE {
log::error!(
"Ignoring sixel data {}x{} because {} bytes > max allowed {}",
w,
h,
size,
MAX_SIXEL_SIZE
);
self.sixel.pixel_width = None;
self.sixel.pixel_height = None;
self.sixel.data.clear();
return;
}
self.sixel.data.reserve(size);
}
remainder = &remainder[matched_len..];