pierrelf.com / we
we (web engine): Experimental web browser project to understand the limits of Claude
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Validate data slice length before Metal texture upload

Prevents potential out-of-bounds read by checking that the data slice
is at least bytes_per_row * height before passing it to Metal's
replaceRegion:withBytes:bytesPerRow: API.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

authored by

Pierre Le Fevre
Claude Opus 4.6 (1M context) and committed by tangled.org 656952ed f2a24bd4

+5
+5
crates/platform/src/metal.rs
··· 504 504 return None; 505 505 } 506 506 507 + let required = bytes_per_row as usize * height as usize; 508 + if data.len() < required { 509 + return None; 510 + } 511 + 507 512 let cls = class!("MTLTextureDescriptor")?; 508 513 let desc: *mut c_void = msg_send![ 509 514 cls.as_ptr(),