From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Benjamin Marzinski Date: Mon, 30 Jul 2018 14:41:55 -0500 Subject: [PATCH] libmultipath: fix memory issue in path_latency prio The path_latency prioriziter was assuming that prepare_directio_read() always succeeds. However, it doesn't, and when it fails, the prioritizer used buf without it pointing to alloced memory. Found by coverity. Signed-off-by: Benjamin Marzinski --- libmultipath/prioritizers/path_latency.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/libmultipath/prioritizers/path_latency.c b/libmultipath/prioritizers/path_latency.c index 765265c..eeee01e 100644 --- a/libmultipath/prioritizers/path_latency.c +++ b/libmultipath/prioritizers/path_latency.c @@ -237,7 +237,8 @@ int getprio(struct path *pp, char *args, unsigned int timeout) lg_maxavglatency = log(MAX_AVG_LATENCY) / lg_base; lg_minavglatency = log(MIN_AVG_LATENCY) / lg_base; - prepare_directio_read(pp->fd, &blksize, &buf, &restore_flags); + if (prepare_directio_read(pp->fd, &blksize, &buf, &restore_flags) < 0) + return PRIO_UNDEF; temp = io_num; while (temp-- > 0) { -- 2.7.4