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selftests/net: psock_fanout seg faults in sock_fanout_read_ring()

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The while loop in sock_fanout_read_ring() checks mmap region
bounds after access, causing it to segfault. Fix it to check
count before accessing header->tp_status. This problem can be
reproduced consistently when the test in run as follows:

    make -C tools/testing/selftests TARGETS=net run_tests
    or
    make run_tests from tools/testing/selftests
    or
    make run_test from tools/testing/selftests/net

Signed-off-by: Shuah Khan <shuahkh@osg.samsung.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Shuah Khan 2014-11-11 10:04:13 -07:00 committed by David S. Miller
parent caa13a9f6a
commit fbf8e7211a
1 changed files with 1 additions and 1 deletions
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2
tools/testing/selftests/net/psock_fanout.c
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@ -128,7 +128,7 @@ static int sock_fanout_read_ring(int fd, void *ring)
struct tpacket2_hdr *header = ring;
int count = 0;
while (header->tp_status & TP_STATUS_USER && count < RING_NUM_FRAMES) {
while (count < RING_NUM_FRAMES && header->tp_status & TP_STATUS_USER) {
count++;
header = ring + (count * getpagesize());
}