CVE-2025-68794

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> iomap: adjust read range correctly for non-block-aligned positions<br /> <br /> iomap_adjust_read_range() assumes that the position and length passed in<br /> are block-aligned. This is not always the case however, as shown in the<br /> syzbot generated case for erofs. This causes too many bytes to be<br /> skipped for uptodate blocks, which results in returning the incorrect<br /> position and length to read in. If all the blocks are uptodate, this<br /> underflows length and returns a position beyond the folio.<br /> <br /> Fix the calculation to also take into account the block offset when<br /> calculating how many bytes can be skipped for uptodate blocks.