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rescanMac: Avoid overallocating/overreading by millions of bytes #22928

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Feb 20, 2025
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rescanMac: Avoid overallocating/overreading by millions of bytes #22928

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6 changes: 2 additions & 4 deletions lib/std/crypto/Certificate/Bundle/macos.zig
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Original file line number Diff line number Diff line change
Expand Up @@ -71,11 +71,9 @@ pub fn rescanMac(cb: *Bundle, gpa: Allocator) RescanMacError!void {

if (cert_header.cert_size == 0) continue;

try cb.bytes.ensureUnusedCapacity(gpa, cert_header.cert_size);

const cert_start = @as(u32, @intCast(cb.bytes.items.len));
const dest_buf = cb.bytes.allocatedSlice()[cert_start..];
cb.bytes.items.len += try reader.readAtLeast(dest_buf, cert_header.cert_size);
const dest_buf = try cb.bytes.addManyAsSlice(gpa, cert_header.cert_size);
try reader.readNoEof(dest_buf);

try cb.parseCert(gpa, cert_start, now_sec);
}
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