CVE-2025-37896
Severity CVSS v4.0:
Pending analysis
Type:
Unavailable / Other
Publication date:
20/05/2025
Last modified:
21/05/2025
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
spi: spi-mem: Add fix to avoid divide error<br />
<br />
For some SPI flash memory operations, dummy bytes are not mandatory. For<br />
example, in Winbond SPINAND flash memory devices, the `write_cache` and<br />
`update_cache` operation variants have zero dummy bytes. Calculating the<br />
duration for SPI memory operations with zero dummy bytes causes<br />
a divide error when `ncycles` is calculated in the<br />
spi_mem_calc_op_duration().<br />
<br />
Add changes to skip the &#39;ncylcles&#39; calculation for zero dummy bytes.<br />
<br />
Following divide error is fixed by this change:<br />
<br />
Oops: divide error: 0000 [#1] PREEMPT SMP NOPTI<br />
...<br />
<br />
? do_trap+0xdb/0x100<br />
? do_error_trap+0x75/0xb0<br />
? spi_mem_calc_op_duration+0x56/0xb0<br />
? exc_divide_error+0x3b/0x70<br />
? spi_mem_calc_op_duration+0x56/0xb0<br />
? asm_exc_divide_error+0x1b/0x20<br />
? spi_mem_calc_op_duration+0x56/0xb0<br />
? spinand_select_op_variant+0xee/0x190 [spinand]<br />
spinand_match_and_init+0x13e/0x1a0 [spinand]<br />
spinand_manufacturer_match+0x6e/0xa0 [spinand]<br />
spinand_probe+0x357/0x7f0 [spinand]<br />
? kernfs_activate+0x87/0xd0<br />
spi_mem_probe+0x7a/0xb0<br />
spi_probe+0x7d/0x130