[Qemu-devel] [PATCH STABLE-0.12] block/vvfat.c: fix warnings with _FORTIFY_SOURCE

[Qemu-devel] [PATCH STABLE-0.12] block/vvfat.c: fix warnings with _FORTIFY_SOURCE

[Amit Shah]

From: Kirill A. Shutemov <kirill@shutemov.name>

CC    block/vvfat.o
cc1: warnings being treated as errors
block/vvfat.c: In function 'commit_one_file':
block/vvfat.c:2259: error: ignoring return value of 'ftruncate', declared with attribute warn_unused_result
make: *** [block/vvfat.o] Error 1
  CC    block/vvfat.o
In file included from /usr/include/stdio.h:912,
                 from ./qemu-common.h:19,
                 from block/vvfat.c:27:
In function 'snprintf',
    inlined from 'init_directories' at block/vvfat.c:871,
    inlined from 'vvfat_open' at block/vvfat.c:1068:
/usr/include/bits/stdio2.h:65: error: call to __builtin___snprintf_chk will always overflow destination buffer
make: *** [block/vvfat.o] Error 1

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
(cherry picked from commit 2dedf83ef0cc3463783d6b71bf1b25476f691f3a)

Signed-off-by: Amit Shah <amit.shah@redhat.com>
---
 block/vvfat.c |    9 +++++++--
 1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/block/vvfat.c b/block/vvfat.c
index c1acb35..592d6e6 100644
--- a/block/vvfat.c
+++ b/block/vvfat.c
@@ -868,7 +868,8 @@ static int init_directories(BDRVVVFATState* s,
     {
 	direntry_t* entry=array_get_next(&(s->directory));
 	entry->attributes=0x28; /* archive | volume label */
-	snprintf((char*)entry->name,11,"QEMU VVFAT");
+	memcpy(entry->name,"QEMU VVF",8);
+	memcpy(entry->extension,"AT ",3);
     }
 
     /* Now build FAT, and write back information into directory */
@@ -2256,7 +2257,11 @@ static int commit_one_file(BDRVVVFATState* s,
 	c = c1;
     }
 
-    ftruncate(fd, size);
+    if (ftruncate(fd, size)) {
+        perror("ftruncate()");
+        close(fd);
+        return -4;
+    }
     close(fd);
 
     return commit_mappings(s, first_cluster, dir_index);
-- 
1.7.0.1

[Qemu-devel] Re: [PATCH STABLE-0.12] block/vvfat.c: fix warnings with _FORTIFY_SOURCE

[Juan Quintela]

Amit Shah <amit.shah@redhat.com> wrote:
> From: Kirill A. Shutemov <kirill@shutemov.name>
>
> CC    block/vvfat.o
> cc1: warnings being treated as errors
> block/vvfat.c: In function 'commit_one_file':
> block/vvfat.c:2259: error: ignoring return value of 'ftruncate', declared with attribute warn_unused_result
> make: *** [block/vvfat.o] Error 1
>   CC    block/vvfat.o
> In file included from /usr/include/stdio.h:912,
>                  from ./qemu-common.h:19,
>                  from block/vvfat.c:27:
> In function 'snprintf',
>     inlined from 'init_directories' at block/vvfat.c:871,
>     inlined from 'vvfat_open' at block/vvfat.c:1068:
> /usr/include/bits/stdio2.h:65: error: call to __builtin___snprintf_chk will always overflow destination buffer
> make: *** [block/vvfat.o] Error 1
>
> Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
> Signed-off-by: Juan Quintela <quintela@redhat.com>
> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
> (cherry picked from commit 2dedf83ef0cc3463783d6b71bf1b25476f691f3a)
>
> Signed-off-by: Amit Shah <amit.shah@redhat.com>

Acked-by: Juan Quintela <quintela@redhat.com>