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Change History

In the Linux kernel, the following vulnerability has been resolved:

iomap: adjust read range correctly for non-block-aligned positions

iomap_adjust_read_range() assumes that the position and length passed in
are block-aligned. This is not always the case however, as shown in the
syzbot generated case for erofs. This causes too many bytes to be
skipped for uptodate blocks, which results in returning the incorrect
position and length to read in. If all the blocks are uptodate, this
underflows length and returns a position beyond the folio.

Fix the calculation to also take into account the block offset when
calculating how many bytes can be skipped for uptodate blocks.

https://git.kernel.org/stable/c/12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e

https://git.kernel.org/stable/c/142194fb21afe964d2d194cab1fc357cbf87e899

https://git.kernel.org/stable/c/7aa6bc3e8766990824f66ca76c19596ce10daf3e

https://git.kernel.org/stable/c/82b60ffbb532d919959702768dca04c3c0500ae5