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remoteproc: avoid stack overflow in debugfs file 

commit 92792e48e2ae6051af30468a87994b5432da2f06 upstream.

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: 2e37abb89a ("remoteproc: create a 'recovery' debugfs entry")
Signed-off-by: Ohad Ben-Cohen <ohad@wizery.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Arnd Bergmann 2015-11-20 18:26:07 +01:00 committed by Greg Kroah-Hartman
parent e9828fd099
commit 2ed0426bd1
1 changed files with 1 additions and 1 deletions
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drivers/remoteproc/remoteproc_debugfs.c
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@ -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);