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tc/tc_filter: Make sure filter name is not empty 

The later check for 'k[0] != 0' requires a non-empty filter name,
otherwise NULL pointer dereference in 'q' might happen.

Signed-off-by: Phil Sutter <phil@nwl.cc>
This commit is contained in:
Phil Sutter 2017-08-24 11:46:33 +02:00 committed by Stephen Hemminger
parent a754de3ccd
commit 75716932a0
1 changed files with 3 additions and 0 deletions
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3
tc/tc_filter.c
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@ -412,6 +412,9 @@ static int tc_filter_get(int cmd, unsigned int flags, int argc, char **argv)
usage(); usage();
return 0; return 0;
} else { } else {
if (!**argv)
invarg("invalid filter name", *argv);
strncpy(k, *argv, sizeof(k)-1); strncpy(k, *argv, sizeof(k)-1);
q = get_filter_kind(k); q = get_filter_kind(k);