diff mbox series

support: Also return fd when it is 0

Message ID 20211006162545.12778-1-siddhesh@sourceware.org
State Committed
Commit 27b6edbb090f736b101f569620d8ad0e7217ddf8
Headers show
Series support: Also return fd when it is 0 | expand

Checks

Context Check Description
dj/TryBot-32bit success Build for i686
dj/TryBot-apply_patch success Patch applied to master at the time it was sent

Commit Message

Siddhesh Poyarekar Oct. 6, 2021, 4:25 p.m. UTC
The fd validity check in open_dev_null checks if fd > 0, which would
lead to a leaked fd if it is == 0.


I also went ahead and adjusted formatting of the file since it was off.

Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>
---

- I own copyright for my submissions to glibc, so using S-o-b
- This is a trivial fix, so I'll push it if there are no objections.

 support/support-open-dev-null-range.c | 14 +++++++-------
 1 file changed, 7 insertions(+), 7 deletions(-)

Comments

Adhemerval Zanella Oct. 6, 2021, 4:34 p.m. UTC | #1
On 06/10/2021 13:25, Siddhesh Poyarekar via Libc-alpha wrote:
> The fd validity check in open_dev_null checks if fd > 0, which would
> lead to a leaked fd if it is == 0.
> 
> 
> I also went ahead and adjusted formatting of the file since it was off.
> 
> Signed-off-by: Siddhesh Poyarekar <siddhesh@sourceware.org>

LGTM, thanks.  Please also backport it to 2.34.

Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

> ---
> 
> - I own copyright for my submissions to glibc, so using S-o-b
> - This is a trivial fix, so I'll push it if there are no objections.
> 
>  support/support-open-dev-null-range.c | 14 +++++++-------
>  1 file changed, 7 insertions(+), 7 deletions(-)
> 
> diff --git a/support/support-open-dev-null-range.c b/support/support-open-dev-null-range.c
> index 80d9dba504..66a8504105 100644
> --- a/support/support-open-dev-null-range.c
> +++ b/support/support-open-dev-null-range.c
> @@ -40,16 +40,16 @@ increase_nofile (void)
>  static int
>  open_dev_null (int flags, mode_t mode)
>  {
> - int fd = open64 ("/dev/null", flags, mode);
> - if (fd > 0)
> -   return fd;
> +  int fd = open64 ("/dev/null", flags, mode);
> +  if (fd >= 0)
> +    return fd;
>  
> - if (fd < 0 && errno != EMFILE)
> -   FAIL_EXIT1 ("open64 (\"/dev/null\", 0x%x, 0%o): %m", flags, mode);
> +  if (fd < 0 && errno != EMFILE)
> +    FAIL_EXIT1 ("open64 (\"/dev/null\", 0x%x, 0%o): %m", flags, mode);
>  
> - increase_nofile ();
> +  increase_nofile ();
>  
> - return xopen ("/dev/null", flags, mode);
> +  return xopen ("/dev/null", flags, mode);
>  }
>  
>  struct range
>
diff mbox series

Patch

diff --git a/support/support-open-dev-null-range.c b/support/support-open-dev-null-range.c
index 80d9dba504..66a8504105 100644
--- a/support/support-open-dev-null-range.c
+++ b/support/support-open-dev-null-range.c
@@ -40,16 +40,16 @@  increase_nofile (void)
 static int
 open_dev_null (int flags, mode_t mode)
 {
- int fd = open64 ("/dev/null", flags, mode);
- if (fd > 0)
-   return fd;
+  int fd = open64 ("/dev/null", flags, mode);
+  if (fd >= 0)
+    return fd;
 
- if (fd < 0 && errno != EMFILE)
-   FAIL_EXIT1 ("open64 (\"/dev/null\", 0x%x, 0%o): %m", flags, mode);
+  if (fd < 0 && errno != EMFILE)
+    FAIL_EXIT1 ("open64 (\"/dev/null\", 0x%x, 0%o): %m", flags, mode);
 
- increase_nofile ();
+  increase_nofile ();
 
- return xopen ("/dev/null", flags, mode);
+  return xopen ("/dev/null", flags, mode);
 }
 
 struct range