From: Johan Hovold <johan(a)kernel.org>
[ Upstream commit f16023834863932f95dfad13fac3fc47f77d2f29 ]
Newer GCC warns about a possible truncation of a generated sysfs path
name as we're concatenating a directory path with a file name and
placing the result in a buffer that is half the size of the maximum
length of the directory path (which is user controlled).
loopback_test.c: In function 'open_poll_files':
loopback_test.c:651:31: warning: '%s' directive output may be truncated writing up to 511 bytes into a region of size 255 [-Wformat-truncation=]
651 | snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count");
| ^~
loopback_test.c:651:3: note: 'snprintf' output between 16 and 527 bytes into a destination of size 255
651 | snprintf(buf, sizeof(buf), "%s%s", dev->sysfs_entry, "iteration_count");
| ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
Fix this by making sure the buffer is large enough the concatenated
strings.
Fixes: 6b0658f68786 ("greybus: tools: Add tools directory to greybus repo and add loopback")
Fixes: 9250c0ee2626 ("greybus: Loopback_test: use poll instead of inotify")
Signed-off-by: Johan Hovold <johan(a)kernel.org>
Link: https://lore.kernel.org/r/20200312110151.22028-3-johan@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh(a)linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal(a)kernel.org>
---
drivers/staging/greybus/tools/loopback_test.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/staging/greybus/tools/loopback_test.c b/drivers/staging/greybus/tools/loopback_test.c
index ba6f905f26fad..5ce7d6fa086cc 100644
--- a/drivers/staging/greybus/tools/loopback_test.c
+++ b/drivers/staging/greybus/tools/loopback_test.c
@@ -637,7 +637,7 @@ int find_loopback_devices(struct loopback_test *t)
static int open_poll_files(struct loopback_test *t)
{
struct loopback_device *dev;
- char buf[MAX_STR_LEN];
+ char buf[MAX_SYSFS_PATH + MAX_STR_LEN];
char dummy;
int fds_idx = 0;
int i;
--
2.20.1
The loopback_test tool hasn't received much love lately. In fact, it has
failed to build for the past two years after a scripted EPOLL*
conversion.
Newer GCC also started warning for potential string truncation of
generated path names; the last two patches addresses that.
Johan
Johan Hovold (3):
staging: greybus: loopback_test: fix poll-mask build breakage
staging: greybus: loopback_test: fix potential path truncation
staging: greybus: loopback_test: fix potential path truncations
drivers/staging/greybus/tools/loopback_test.c | 21 ++++++++++---------
1 file changed, 11 insertions(+), 10 deletions(-)
--
2.24.1
Nothing outside of low level architecture code is supposed to look up
interrupt descriptors and fiddle with them.
Replace the open coded abuse by calling generic_handle_irq().
This still does not explain why and in which context this connection
magic is injecting interrupts in the first place and why this is correct
and safe, but at least the API abuse is gone.
Fixes: 036aad9d0224 ("greybus: gpio: add interrupt handling support")
Fixes: 2611ebef8322 ("greybus: gpio: don't call irq-flow handler directly")
Signed-off-by: Thomas Gleixner <tglx(a)linutronix.de>
---
drivers/staging/greybus/gpio.c | 15 ++++++---------
1 file changed, 6 insertions(+), 9 deletions(-)
--- a/drivers/staging/greybus/gpio.c
+++ b/drivers/staging/greybus/gpio.c
@@ -364,8 +364,7 @@ static int gb_gpio_request_handler(struc
struct gb_message *request;
struct gb_gpio_irq_event_request *event;
u8 type = op->type;
- int irq;
- struct irq_desc *desc;
+ int irq, ret;
if (type != GB_GPIO_TYPE_IRQ_EVENT) {
dev_err(dev, "unsupported unsolicited request: %u\n", type);
@@ -391,17 +390,15 @@ static int gb_gpio_request_handler(struc
dev_err(dev, "failed to find IRQ\n");
return -EINVAL;
}
- desc = irq_to_desc(irq);
- if (!desc) {
- dev_err(dev, "failed to look up irq\n");
- return -EINVAL;
- }
local_irq_disable();
- generic_handle_irq_desc(desc);
+ ret = generic_handle_irq(irq);
local_irq_enable();
- return 0;
+ if (ret)
+ dev_err(dev, "failed to invoke irq handler\n");
+
+ return ret;
}
static int gb_gpio_request(struct gpio_chip *chip, unsigned int offset)