| Message ID | 20241111-input-ads7846-increase-xfer-array-size-v1-1-06cd92e9f20f@kernel.org (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | Input: ads7846 - Increase xfer array size in 'struct ser_req' | expand |
On 11/11/24 4:09 PM, Nathan Chancellor wrote: > Clang warns (or errors with CONFIG_WERROR=y, trimmed for brevity): > > drivers/input/touchscreen/ads7846.c:412:2: error: array index 6 is past the end of the array (that has type 'struct spi_transfer[6]') [-Werror,-Warray-bounds] > 412 | req->xfer[6].tx_buf = &req->scratch; > | ^ ~ > ... > drivers/input/touchscreen/ads7846.c:416:2: error: array index 7 is past the end of the array (that has type 'struct spi_transfer[6]') [-Werror,-Warray-bounds] > 416 | req->xfer[7].rx_buf = &req->scratch; > | ^ ~ > drivers/input/touchscreen/ads7846.c:334:2: note: array 'xfer' declared here > 334 | struct spi_transfer xfer[6]; > | ^ > > Increase the size of xfer in 'struct ser_req' to ensure that there is > enough space for all necessary members and there are no out of bounds > accesses, clearing up the warning. > > Fixes: 781a07da9bb9 ("Input: ads7846 - add dummy command register clearing cycle") > Signed-off-by: Nathan Chancellor <nathan@kernel.org> > --- > drivers/input/touchscreen/ads7846.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c > index f7bc0a3e56d86932823b6bc0dcd6bcd8e1b9b5c2..7b3711a3597c86f18c45d040f73bef884ec3c4aa 100644 > --- a/drivers/input/touchscreen/ads7846.c > +++ b/drivers/input/touchscreen/ads7846.c > @@ -331,7 +331,7 @@ struct ser_req { > u8 ref_off; > u16 scratch; > struct spi_message msg; > - struct spi_transfer xfer[6]; > + struct spi_transfer xfer[8]; Sigh ... Reviewed-by: Marek Vasut <marex@denx.de> Thank you
diff --git a/drivers/input/touchscreen/ads7846.c b/drivers/input/touchscreen/ads7846.c index f7bc0a3e56d86932823b6bc0dcd6bcd8e1b9b5c2..7b3711a3597c86f18c45d040f73bef884ec3c4aa 100644 --- a/drivers/input/touchscreen/ads7846.c +++ b/drivers/input/touchscreen/ads7846.c @@ -331,7 +331,7 @@ struct ser_req { u8 ref_off; u16 scratch; struct spi_message msg; - struct spi_transfer xfer[6]; + struct spi_transfer xfer[8]; /* * DMA (thus cache coherency maintenance) requires the * transfer buffers to live in their own cache lines.
Clang warns (or errors with CONFIG_WERROR=y, trimmed for brevity): drivers/input/touchscreen/ads7846.c:412:2: error: array index 6 is past the end of the array (that has type 'struct spi_transfer[6]') [-Werror,-Warray-bounds] 412 | req->xfer[6].tx_buf = &req->scratch; | ^ ~ ... drivers/input/touchscreen/ads7846.c:416:2: error: array index 7 is past the end of the array (that has type 'struct spi_transfer[6]') [-Werror,-Warray-bounds] 416 | req->xfer[7].rx_buf = &req->scratch; | ^ ~ drivers/input/touchscreen/ads7846.c:334:2: note: array 'xfer' declared here 334 | struct spi_transfer xfer[6]; | ^ Increase the size of xfer in 'struct ser_req' to ensure that there is enough space for all necessary members and there are no out of bounds accesses, clearing up the warning. Fixes: 781a07da9bb9 ("Input: ads7846 - add dummy command register clearing cycle") Signed-off-by: Nathan Chancellor <nathan@kernel.org> --- drivers/input/touchscreen/ads7846.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- base-commit: bed0f75909b21c0cd0285da76fdfcc61a9745b0c change-id: 20241111-input-ads7846-increase-xfer-array-size-2603a15ad062 Best regards,