Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
Linux9dc55f1389f9569acf9659e58dd836a9c70df217 – < ce20f49ac9194cf81a77f01d1c316d7c17ae753cce20f49ac9194cf81a77f01d1c316d7c17ae753cCNA
Linux9dc55f1389f9569acf9659e58dd836a9c70df217 – < 275b37a1e5c2c8abd313e8075f6aec9a349f291b275b37a1e5c2c8abd313e8075f6aec9a349f291bCNA
Linux9dc55f1389f9569acf9659e58dd836a9c70df217 – < b8c9f25fd84328c5fcc4f70c6d1e8f1d4787eaacb8c9f25fd84328c5fcc4f70c6d1e8f1d4787eaacCNA
Linux9dc55f1389f9569acf9659e58dd836a9c70df217 – < 82b60ffbb532d919959702768dca04c3c0500ae582b60ffbb532d919959702768dca04c3c0500ae5CNA
Linux9dc55f1389f9569acf9659e58dd836a9c70df217 – < 12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3e12053695c8ef5410e8cc6c9ed4c0db9cd9c82b3eCNA
Linux9dc55f1389f9569acf9659e58dd836a9c70df217 – < 142194fb21afe964d2d194cab1fc357cbf87e899142194fb21afe964d2d194cab1fc357cbf87e899CNA
Linux9dc55f1389f9569acf9659e58dd836a9c70df217 – < 7aa6bc3e8766990824f66ca76c19596ce10daf3e7aa6bc3e8766990824f66ca76c19596ce10daf3eCNA
Linux4.19–CNA
by Kastro