| Message ID | 20241004125400.1791089-1-leitao@debian.org |
|---|---|
| State | New |
| Headers | show |
| Series | spi: tegra210-quad: Avoid shift-out-of-bounds | expand |
On Fri, 04 Oct 2024 05:53:59 -0700, Breno Leitao wrote: > A shift-out-of-bounds issue was identified by UBSAN in the > tegra_qspi_fill_tx_fifo_from_client_txbuf() function. > > UBSAN: shift-out-of-bounds in drivers/spi/spi-tegra210-quad.c:345:27 > shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int') > Call trace: > tegra_qspi_start_cpu_based_transfer > > [...] Applied to https://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi.git for-next Thanks! [1/1] spi: tegra210-quad: Avoid shift-out-of-bounds commit: f399051ec1ff02e74ae5c2517aed2cc486fd005b All being well this means that it will be integrated into the linux-next tree (usually sometime in the next 24 hours) and sent to Linus during the next merge window (or sooner if it is a bug fix), however if problems are discovered then the patch may be dropped or reverted. You may get further e-mails resulting from automated or manual testing and review of the tree, please engage with people reporting problems and send followup patches addressing any issues that are reported if needed. If any updates are required or you are submitting further changes they should be sent as incremental updates against current git, existing patches will not be replaced. Please add any relevant lists and maintainers to the CCs when replying to this mail. Thanks, Mark
diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c index afbd64a217eb..43f11b0e9e76 100644 --- a/drivers/spi/spi-tegra210-quad.c +++ b/drivers/spi/spi-tegra210-quad.c @@ -341,7 +341,7 @@ tegra_qspi_fill_tx_fifo_from_client_txbuf(struct tegra_qspi *tqspi, struct spi_t for (count = 0; count < max_n_32bit; count++) { u32 x = 0; - for (i = 0; len && (i < bytes_per_word); i++, len--) + for (i = 0; len && (i < min(4, bytes_per_word)); i++, len--) x |= (u32)(*tx_buf++) << (i * 8); tegra_qspi_writel(tqspi, x, QSPI_TX_FIFO); }
A shift-out-of-bounds issue was identified by UBSAN in the tegra_qspi_fill_tx_fifo_from_client_txbuf() function. UBSAN: shift-out-of-bounds in drivers/spi/spi-tegra210-quad.c:345:27 shift exponent 32 is too large for 32-bit type 'u32' (aka 'unsigned int') Call trace: tegra_qspi_start_cpu_based_transfer The problem arises when shifting the contents of tx_buf left by 8 times the value of i, which can exceed 4 and result in an exponent larger than 32 bits. Resolve this by restrict the value of i to be less than 4, preventing the shift operation from overflowing. Signed-off-by: Breno Leitao <leitao@debian.org> Fixes: 921fc1838fb0 ("spi: tegra210-quad: Add support for Tegra210 QSPI controller") --- drivers/spi/spi-tegra210-quad.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)