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authorJohan Hovold <johan@kernel.org>2020-03-12 12:01:50 +0100
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2020-03-17 14:17:32 +0100
commitf16023834863932f95dfad13fac3fc47f77d2f29 (patch)
tree0c0c4aec962387b29b1aaca590ec0ec10a6672b2 /drivers
parent8f3675be4bda33adbdc1dd2ab3b6c76a7599a79e (diff)
staging: greybus: loopback_test: fix potential path truncation
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@kernel.org> Link: https://lore.kernel.org/r/20200312110151.22028-3-johan@kernel.org Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/staging/greybus/tools/loopback_test.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/staging/greybus/tools/loopback_test.c b/drivers/staging/greybus/tools/loopback_test.c
index 41e1820d9ac9..d38bb4fbd6b9 100644
--- a/drivers/staging/greybus/tools/loopback_test.c
+++ b/drivers/staging/greybus/tools/loopback_test.c
@@ -637,7 +637,7 @@ baddir:
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;