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Date: Fri, 15 Jan 2016 15:58:44 -0800 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Arnd Bergmann <arnd@...db.de>, Ohad Ben-Cohen <ohad@...ery.com>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 4.2.y-ckt 110/305] remoteproc: avoid stack overflow in debugfs file 4.2.8-ckt2 -stable review patch. If anyone has any objections, please let me know. ---8<------------------------------------------------------------ From: Arnd Bergmann <arnd@...db.de> 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@...db.de> Fixes: 2e37abb89a2e ("remoteproc: create a 'recovery' debugfs entry") Signed-off-by: Ohad Ben-Cohen <ohad@...ery.com> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- drivers/remoteproc/remoteproc_debugfs.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/remoteproc/remoteproc_debugfs.c b/drivers/remoteproc/remoteproc_debugfs.c index 9d30809..916af50 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); -- 1.9.1
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