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authorArnd Bergmann <arnd@arndb.de>2018-03-13 23:58:39 +0300
committerDavid S. Miller <davem@davemloft.net>2018-03-14 03:25:26 +0300
commita870a02cc963de35452bbed932560ed69725c4f2 (patch)
treed3623f2998c7f30116ddac3de20724ff341a45bc /net/core/pktgen.c
parentbe9fc0971a5c27b791608cf9705a04fe96dbd395 (diff)
downloadlinux-a870a02cc963de35452bbed932560ed69725c4f2.tar.xz
pktgen: use dynamic allocation for debug print buffer
After the removal of the VLA, we get a harmless warning about a large stack frame: net/core/pktgen.c: In function 'pktgen_if_write': net/core/pktgen.c:1710:1: error: the frame size of 1076 bytes is larger than 1024 bytes [-Werror=frame-larger-than=] The function was previously shown to be safe despite hitting the 1024 bye warning level. To get rid of the annoyging warning, while keeping it readable, this changes it to use strndup_user(). Obviously this is not a fast path, so the kmalloc() overhead can be disregarded. Fixes: 35951393bbff ("pktgen: Remove VLA usage") Signed-off-by: Arnd Bergmann <arnd@arndb.de> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/core/pktgen.c')
-rw-r--r--net/core/pktgen.c15
1 files changed, 8 insertions, 7 deletions
diff --git a/net/core/pktgen.c b/net/core/pktgen.c
index e2d6ae3b290b..fd65761e1fed 100644
--- a/net/core/pktgen.c
+++ b/net/core/pktgen.c
@@ -906,13 +906,14 @@ static ssize_t pktgen_if_write(struct file *file,
i += len;
if (debug) {
- size_t copy = min_t(size_t, count, 1023);
- char tb[1024];
- if (copy_from_user(tb, user_buffer, copy))
- return -EFAULT;
- tb[copy] = 0;
- pr_debug("%s,%lu buffer -:%s:-\n",
- name, (unsigned long)count, tb);
+ size_t copy = min_t(size_t, count + 1, 1024);
+ char *tp = strndup_user(user_buffer, copy);
+
+ if (IS_ERR(tp))
+ return PTR_ERR(tp);
+
+ pr_debug("%s,%zu buffer -:%s:-\n", name, count, tp);
+ kfree(buf);
}
if (!strcmp(name, "min_pkt_size")) {