Patchwork [13/17] linux-user/mmap.c: fix warnings with _FORTIFY_SOURCE

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Submitter Juan Quintela
Date Jan. 20, 2010, 8:14 p.m.
Message ID <c2e092e8a1731d2275f2534c3d4195814893595d.1264017981.git.quintela@redhat.com>
Download mbox | patch
Permalink /patch/43356/
State New
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Comments

Juan Quintela - Jan. 20, 2010, 8:14 p.m.
From: Kirill A. Shutemov <kirill@shutemov.name>

CC    i386-linux-user/mmap.o
cc1: warnings being treated as errors
/usr/src/RPM/BUILD/qemu-0.11.92/linux-user/mmap.c: In function 'mmap_frag':
/usr/src/RPM/BUILD/qemu-0.11.92/linux-user/mmap.c:253: error: ignoring return value of 'pread', declared with attribute warn_unused_result
/usr/src/RPM/BUILD/qemu-0.11.92/linux-user/mmap.c: In function 'target_mmap':
/usr/src/RPM/BUILD/qemu-0.11.92/linux-user/mmap.c:477: error: ignoring return value of 'pread', declared with attribute warn_unused_result
make[1]: *** [mmap.o] Error 1

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
Signed-off-by: Juan Quintela <quintela@redhat.com>
---
 linux-user/mmap.c |    6 ++++--
 1 files changed, 4 insertions(+), 2 deletions(-)

Patch

diff --git a/linux-user/mmap.c b/linux-user/mmap.c
index 144fb7c..c1c7e48 100644
--- a/linux-user/mmap.c
+++ b/linux-user/mmap.c
@@ -250,7 +250,8 @@  static int mmap_frag(abi_ulong real_start,
             mprotect(host_start, qemu_host_page_size, prot1 | PROT_WRITE);

         /* read the corresponding file data */
-        pread(fd, g2h(start), end - start, offset);
+        if (pread(fd, g2h(start), end - start, offset) == -1)
+            return -1;

         /* put final protection */
         if (prot_new != (prot1 | PROT_WRITE))
@@ -474,7 +475,8 @@  abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
                                   -1, 0);
             if (retaddr == -1)
                 goto fail;
-            pread(fd, g2h(start), len, offset);
+            if (pread(fd, g2h(start), len, offset) == -1)
+                goto fail;
             if (!(prot & PROT_WRITE)) {
                 ret = target_mprotect(start, len, prot);
                 if (ret != 0) {