The following commit has been merged into the core/rcu branch of tip:
Commit-ID: 58db5785b0d76be4582a32a7900acce88e691d36
Gitweb:
https://git.kernel.org/tip/58db5785b0d76be4582a32a7900acce88e691d36
Author: Colin Ian King <colin.k...@canonical.com>
AuthorDate: Thu, 16 Jul 2020 15:38:56 +01:00
Committer: Paul E. McKenney <paul...@kernel.org>
CommitterDate: Mon, 24 Aug 2020 18:45:35 -07:00
refperf: Avoid null pointer dereference when buf fails to allocate
Currently in the unlikely event that buf fails to be allocated it
is dereferenced a few times. Use the errexit flag to determine if
buf should be written to to avoid the null pointer dereferences.
Addresses-Coverity: ("Dereference after null check")
Fixes: f518f154ecef ("refperf: Dynamically allocate experiment-summary output
buffer")
Signed-off-by: Colin Ian King <colin.k...@canonical.com>
Signed-off-by: Paul E. McKenney <paul...@kernel.org>
---
kernel/rcu/refscale.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
diff --git a/kernel/rcu/refscale.c b/kernel/rcu/refscale.c
index d9291f8..952595c 100644
--- a/kernel/rcu/refscale.c
+++ b/kernel/rcu/refscale.c
@@ -546,9 +546,11 @@ static int main_func(void *arg)
// Print the average of all experiments
SCALEOUT("END OF TEST. Calculating average duration per loop
(nanoseconds)...\n");
- buf[0] = 0;
- strcat(buf, "\n");
- strcat(buf, "Runs\tTime(ns)\n");
+ if (!errexit) {
+ buf[0] = 0;
+ strcat(buf, "\n");
+ strcat(buf, "Runs\tTime(ns)\n");
+ }
for (exp = 0; exp < nruns; exp++) {
u64 avg;
