Description
In the Linux kernel, the following vulnerability has been resolved: dmaengine: tegra: Fix burst size calculation Currently, the Tegra GPC DMA hardware requires the transfer length to be a multiple of the max burst size configured for the channel. When a client requests a transfer where the length is not evenly divisible by the configured max burst size, the DMA hangs with partial burst at the end. Fix this by reducing the burst size to the largest power-of-2 value that evenly divides the transfer length. For example, a 40-byte transfer with a 16-byte max burst will now use an 8-byte burst (40 / 8 = 5 complete bursts) instead of causing a hang. This issue was observed with the PL011 UART driver where TX DMA transfers of arbitrary lengths were stuck.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
ee17028009d49fffed8cc963455d33b1fd3f1d08 to < 735951baa311c66353405dcac39375dd66441db0affectedee17028009d49fffed8cc963455d33b1fd3f1d08 to < 8f0f5de1091119679d87f60dfb1acbff4b2a0ed3affectedee17028009d49fffed8cc963455d33b1fd3f1d08 to < a3b76b54e06d73166af4d1a284a0e0711889060caffectedee17028009d49fffed8cc963455d33b1fd3f1d08 to < 7926c1e4be86379945fb5f168888ac4d2aaf6c91affectedee17028009d49fffed8cc963455d33b1fd3f1d08 to < 6e37e9e230c7e848bd8e8cd4db15bb18bcf11ad1affectedee17028009d49fffed8cc963455d33b1fd3f1d08 to < 4651df83b6c796daead3447e8fd874322918ee4faffected
Linux Linux
Default version status: affected
5.19affected0 to < 5.19unaffected6.1.178 to ≤ 6.1.*unaffected6.6.145 to ≤ 6.6.*unaffected6.12.97 to ≤ 6.12.*unaffected6.18.40 to ≤ 6.18.*unaffected7.1.5 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/735951baa311c66353405dcac39375dd66441db0 ↗
- https://git.kernel.org/stable/c/8f0f5de1091119679d87f60dfb1acbff4b2a0ed3 ↗
- https://git.kernel.org/stable/c/a3b76b54e06d73166af4d1a284a0e0711889060c ↗
- https://git.kernel.org/stable/c/7926c1e4be86379945fb5f168888ac4d2aaf6c91 ↗
- https://git.kernel.org/stable/c/6e37e9e230c7e848bd8e8cd4db15bb18bcf11ad1 ↗
- https://git.kernel.org/stable/c/4651df83b6c796daead3447e8fd874322918ee4f ↗