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copy_file_range: limit len to prevent EOVERFLOW

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rpkak 2025-10-29 15:44:18 +01:00
parent a7119d4269
commit dea342cba3
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1 changed files with 4 additions and 1 deletions
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5
lib/std/fs/File.zig
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@ -1926,9 +1926,11 @@ pub const Writer = struct {
return sendFileBuffered(io_w, file_reader, reader_buffered);
var off_in: i64 = undefined;
var off_out: i64 = undefined;
var len: usize = @intFromEnum(limit);
const off_in_ptr: ?*i64 = switch (file_reader.mode) {
.positional_reading, .streaming_reading => return error.Unimplemented,
.positional => p: {
len = @min(len, std.math.maxInt(usize) - file_reader.pos);
off_in = @intCast(file_reader.pos);
break :p &off_in;
},
@ -1938,13 +1940,14 @@ pub const Writer = struct {
const off_out_ptr: ?*i64 = switch (w.mode) {
.positional_reading, .streaming_reading => return error.Unimplemented,
.positional => p: {
len = @min(len, std.math.maxInt(usize) - w.pos);
off_out = @intCast(w.pos);
break :p &off_out;
},
.streaming => null,
.failure => return error.WriteFailed,
};
const n = copy_file_range(in_fd, off_in_ptr, out_fd, off_out_ptr, @intFromEnum(limit), 0) catch |err| {
const n = copy_file_range(in_fd, off_in_ptr, out_fd, off_out_ptr, len, 0) catch |err| {
w.copy_file_range_err = err;
return 0;
};