From: Lendacky, Thomas Date: Tue, 15 Nov 2016 22:11:05 +0000 (-0600) Subject: amd-xgbe: Fix possible uninitialized variable X-Git-Tag: v4.10-rc1~202^2~253^2~1 X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=5e4cbaa7fb69609737c57b42378e91a82e2960e0;p=linux.git amd-xgbe: Fix possible uninitialized variable The debugfs support in the driver uses a common routine to write the debugfs values. In this routine, if the input file position is non-zero then the write routine will not return an error and an output parameter will not have been set. Because an error isn't returned an uninitialized value will be written into a register. Fix the common write routine to return an error if the input file position is non-zero, which will propagate back to the caller. Reported-by: Dan Carpenter Signed-off-by: Tom Lendacky Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/amd/xgbe/xgbe-debugfs.c b/drivers/net/ethernet/amd/xgbe/xgbe-debugfs.c index 0c0140decbc2..7546b660d6b5 100644 --- a/drivers/net/ethernet/amd/xgbe/xgbe-debugfs.c +++ b/drivers/net/ethernet/amd/xgbe/xgbe-debugfs.c @@ -153,7 +153,7 @@ static ssize_t xgbe_common_write(const char __user *buffer, size_t count, int ret; if (*ppos != 0) - return 0; + return -EINVAL; if (count >= sizeof(workarea)) return -ENOSPC;