Messages in this thread Patch in this message | | | From | Arnd Bergmann <> | Subject | [PATCH] remoteproc: avoid stack overflow in debugfs file | Date | Fri, 20 Nov 2015 18:26:07 +0100 |
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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")
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);
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