From: Gaetan Rivet <gaetan.rivet@6wind.com>
To: dev@dpdk.org
Cc: Gaetan Rivet <gaetan.rivet@6wind.com>
Subject: [dpdk-dev] [PATCH] eal: fix off-by-one error in hotplug add
Date: Fri, 4 Aug 2017 17:30:23 +0200 [thread overview]
Message-ID: <1501860623-16747-1-git-send-email-gaetan.rivet@6wind.com> (raw)
snprintf returns the length it would have written had the given length
been enough, *terminating null byte excluded*.
It will however limit the length of its writing to given length minus
one, and always put a terminating null-byte at the end of the string.
This must be taken into account when calculating the total length of the
device declaration string.
Fixes: 3054036f054a ("eal: fix possible crash in hotplug")
Signed-off-by: Gaetan Rivet <gaetan.rivet@6wind.com>
---
Charybdis -> Scylla
lib/librte_eal/common/eal_common_dev.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/lib/librte_eal/common/eal_common_dev.c b/lib/librte_eal/common/eal_common_dev.c
index fc8a4d2..e251275 100644
--- a/lib/librte_eal/common/eal_common_dev.c
+++ b/lib/librte_eal/common/eal_common_dev.c
@@ -133,7 +133,7 @@ full_dev_name(const char *bus, const char *dev, const char *args)
char *name;
size_t len;
- len = snprintf(NULL, 0, "%s:%s,%s", bus, dev, args);
+ len = snprintf(NULL, 0, "%s:%s,%s", bus, dev, args) + 1;
name = calloc(1, len);
if (name == NULL) {
RTE_LOG(ERR, EAL, "Could not allocate full device name\n");
--
2.1.4
next reply other threads:[~2017-08-04 15:30 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-08-04 15:30 Gaetan Rivet [this message]
2017-08-04 16:12 ` Thomas Monjalon
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