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| author | Arnd Bergmann <arnd@arndb.de> | 2015-11-20 18:26:07 +0100 |
|---|---|---|
| committer | Ohad Ben-Cohen <ohad@wizery.com> | 2015-11-26 09:07:53 +0100 |
| commit | 92792e48e2ae6051af30468a87994b5432da2f06 (patch) | |
| tree | 3e35802656103fb2b4671e660c8dbdadf62066cd /drivers/remoteproc | |
| parent | Linux 4.4-rc2 (diff) | |
| download | linux-92792e48e2ae6051af30468a87994b5432da2f06.tar.xz linux-92792e48e2ae6051af30468a87994b5432da2f06.zip | |
remoteproc: avoid stack overflow in debugfs file
Recent gcc versions warn about reading from a negative offset of
an on-stack array:
drivers/remoteproc/remoteproc_debugfs.c: In function 'rproc_recovery_write':
drivers/remoteproc/remoteproc_debugfs.c:167:9: warning: 'buf[4294967295u]' may be used uninitialized in this function [-Wmaybe-uninitialized]
I don't see anything in sys_write() that prevents us from
being called with a zero 'count' argument, so we should
add an extra check in rproc_recovery_write() to prevent the
access and avoid the warning.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 2e37abb89a2e ("remoteproc: create a 'recovery' debugfs entry")
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Diffstat (limited to 'drivers/remoteproc')
| -rw-r--r-- | drivers/remoteproc/remoteproc_debugfs.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c index 9d30809bb407..916af5096f57 100644 --- a/drivers/remoteproc/remoteproc_debugfs.c +++ b/drivers/remoteproc/remoteproc_debugfs.c @@ -156,7 +156,7 @@ rproc_recovery_write(struct file *filp, const char __user *user_buf, char buf[10]; int ret; - if (count > sizeof(buf)) + if (count < 1 || count > sizeof(buf)) return count; ret = copy_from_user(buf, user_buf, count); |