[v1] linux-user and tcg patch queue

[PATCH 05/60] linux-user/elfload: Latch errno before cleanup in elf_core_dump

Richard Henderson posted 60 patches 1 year, 11 months ago

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Maintainers: Richard Henderson <richard.henderson@linaro.org>, Paolo Bonzini <pbonzini@redhat.com>, Riku Voipio <riku.voipio@iki.fi>, Warner Losh <imp@bsdimp.com>, Kyle Evans <kevans@freebsd.org>, Stefan Berger <stefanb@linux.vnet.ibm.com>, Eduardo Habkost <eduardo@habkost.net>, Marcel Apfelbaum <marcel.apfelbaum@gmail.com>, "Philippe Mathieu-Daudé" <philmd@linaro.org>, Yanan Wang <wangyanan55@huawei.com>, Laurent Vivier <laurent@vivier.eu>, Peter Xu <peterx@redhat.com>, Fabiano Rosas <farosas@suse.de>, David Hildenbrand <david@redhat.com>, Peter Maydell <peter.maydell@linaro.org>, Nicholas Piggin <npiggin@gmail.com>, Daniel Henrique Barboza <danielhb413@gmail.com>, "Cédric Le Goater" <clg@kaod.org>, "Alex Bennée" <alex.bennee@linaro.org>, Yoshinori Sato <ysato@users.sourceforge.jp>

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[PATCH 05/60] linux-user/elfload: Latch errno before cleanup in elf_core_dump

Posted by Richard Henderson 1 year, 11 months ago

On the off-chance that one of the cleanup functions changes
errno, latch the errno that we want to return beforehand.

Flush errno to 0 upon success, rather than at the beginning.
No need to avoid negation of 0.

Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
---
 linux-user/elfload.c | 12 +++++-------
 1 file changed, 5 insertions(+), 7 deletions(-)

diff --git a/linux-user/elfload.c b/linux-user/elfload.c
index 98b82b1a49..39d9ef9acc 100644
--- a/linux-user/elfload.c
+++ b/linux-user/elfload.c
@@ -4634,8 +4634,7 @@ static int elf_core_dump(int signr, const CPUArchState *env)
     off_t offset = 0, data_offset = 0;
     int segs = 0;
     int fd = -1;
-
-    errno = 0;
+    int ret;
 
     if (prctl(PR_GET_DUMPABLE) == 0) {
         return 0;
@@ -4755,15 +4754,14 @@ static int elf_core_dump(int signr, const CPUArchState *env)
                 goto out;
         }
     }
+    errno = 0;
 
  out:
+    ret = -errno;
     free_note_info(&info);
     vma_delete(&mm);
-    (void) close(fd);
-
-    if (errno != 0)
-        return (-errno);
-    return (0);
+    close(fd);
+    return ret;
 }
 #endif /* USE_ELF_CORE_DUMP */
 
-- 
2.34.1