patches for DPDK stable branches
 help / color / mirror / Atom feed
* [dpdk-stable] [PATCH] eal/windows: fix incorrect free condition in getopt implementation
@ 2020-09-23 14:15 Tal Shnaiderman
  2020-09-24 23:17 ` Dmitry Kozlyuk
  0 siblings, 1 reply; 3+ messages in thread
From: Tal Shnaiderman @ 2020-09-23 14:15 UTC (permalink / raw)
  To: dev
  Cc: thomas, pallavi.kadam, dmitry.kozliuk, ranjit.menon, navasile,
	dmitrym, stable

In the Windows getopt_internal function the condition freeing
the memory allocated by _dupenv_s is correct only for the first
call to the function.

the next callers will try to free the buffer even though the _dupenv_s
call is skipped if the POSIXLY_CORRECT env isn't found (undefined behavior).

Fixed by releasing the buffer in the scope of the same if statement calling _dupenv_s

Fixes: 5e373e456e6acdc ("eal/windows: add getopt implementation")
Cc: stable@dpdk.org

Signed-off-by: Tal Shnaiderman <talshn@nvidia.com>
---
 lib/librte_eal/windows/getopt.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/lib/librte_eal/windows/getopt.c b/lib/librte_eal/windows/getopt.c
index a08f7c109b..20da225a68 100644
--- a/lib/librte_eal/windows/getopt.c
+++ b/lib/librte_eal/windows/getopt.c
@@ -253,16 +253,17 @@ getopt_internal(int nargc, char **nargv, const char *options,
 	 * Disable GNU extensions if POSIXLY_CORRECT is set or options
 	 * string begins with a '+'.
 	 */
-	if (posixly_correct == -1)
+	if (posixly_correct == -1) {
 		posixly_correct = _dupenv_s(&buf, &len, "POSIXLY_CORRECT");
+		if (!posixly_correct)
+			free(buf);
+	}
 	if (!posixly_correct || *options == '+')
 		flags &= ~FLAG_PERMUTE;
 	else if (*options == '-')
 		flags |= FLAG_ALLARGS;
 	if (*options == '+' || *options == '-')
 		options++;
-	if (!posixly_correct)
-		free(buf);
 	/*
 	 * reset if requested
 	 */
-- 
2.16.1.windows.4


^ permalink raw reply	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2020-09-25 16:59 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-09-23 14:15 [dpdk-stable] [PATCH] eal/windows: fix incorrect free condition in getopt implementation Tal Shnaiderman
2020-09-24 23:17 ` Dmitry Kozlyuk
2020-09-25 16:59   ` Tal Shnaiderman

patches for DPDK stable branches

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://inbox.dpdk.org/stable/0 stable/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 stable stable/ https://inbox.dpdk.org/stable \
		stable@dpdk.org
	public-inbox-index stable

Example config snippet for mirrors.
Newsgroup available over NNTP:
	nntp://inbox.dpdk.org/inbox.dpdk.stable


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git