5.15-stable review patch. If anyone has any objections, please let me know.
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From: Kent Gibson warthog618@gmail.com
[ Upstream commit 9919cce62f68e6ab68dc2a975b5dc670f8ca7d40 ]
linehandle_set_config() behaves badly when direction is not set. The configuration validation is borrowed from linehandle_create(), where, to verify the intent of the user, the direction must be set to in order to effect a change to the electrical configuration of a line. But, when applied to reconfiguration, that validation does not allow for the unset direction case, making it possible to clear flags set previously without specifying the line direction.
Adding to the inconsistency, those changes are not immediately applied by linehandle_set_config(), but will take effect when the line value is next get or set.
For example, by requesting a configuration with no flags set, an output line with GPIOHANDLE_REQUEST_ACTIVE_LOW and GPIOHANDLE_REQUEST_OPEN_DRAIN requested could have those flags cleared, inverting the sense of the line and changing the line drive to push-pull on the next line value set.
Ensure the intent of the user by disallowing configurations which do not have direction set, returning an error to userspace to indicate that the configuration is invalid.
And, for clarity, use lflags, a local copy of gcnf.flags, throughout when dealing with the requested flags, rather than a mixture of both.
Fixes: e588bb1eae31 ("gpio: add new SET_CONFIG ioctl() to gpio chardev") Signed-off-by: Kent Gibson warthog618@gmail.com Link: https://lore.kernel.org/r/20240626052925.174272-2-warthog618@gmail.com Signed-off-by: Bartosz Golaszewski bartosz.golaszewski@linaro.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpio/gpiolib-cdev.c | 16 ++++++++++------ 1 file changed, 10 insertions(+), 6 deletions(-)
diff --git a/drivers/gpio/gpiolib-cdev.c b/drivers/gpio/gpiolib-cdev.c index 1db991cb2efce..c2f9d95d1086f 100644 --- a/drivers/gpio/gpiolib-cdev.c +++ b/drivers/gpio/gpiolib-cdev.c @@ -127,6 +127,10 @@ struct linehandle_state { GPIOHANDLE_REQUEST_OPEN_DRAIN | \ GPIOHANDLE_REQUEST_OPEN_SOURCE)
+#define GPIOHANDLE_REQUEST_DIRECTION_FLAGS \ + (GPIOHANDLE_REQUEST_INPUT | \ + GPIOHANDLE_REQUEST_OUTPUT) + static int linehandle_validate_flags(u32 flags) { /* Return an error if an unknown flag is set */ @@ -207,21 +211,21 @@ static long linehandle_set_config(struct linehandle_state *lh, if (ret) return ret;
+ /* Lines must be reconfigured explicitly as input or output. */ + if (!(lflags & GPIOHANDLE_REQUEST_DIRECTION_FLAGS)) + return -EINVAL; + for (i = 0; i < lh->num_descs; i++) { desc = lh->descs[i]; - linehandle_flags_to_desc_flags(gcnf.flags, &desc->flags); + linehandle_flags_to_desc_flags(lflags, &desc->flags);
- /* - * Lines have to be requested explicitly for input - * or output, else the line will be treated "as is". - */ if (lflags & GPIOHANDLE_REQUEST_OUTPUT) { int val = !!gcnf.default_values[i];
ret = gpiod_direction_output(desc, val); if (ret) return ret; - } else if (lflags & GPIOHANDLE_REQUEST_INPUT) { + } else { ret = gpiod_direction_input(desc); if (ret) return ret;