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pci-assign: avoid pointless stat

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Just check the errno value after fopen and follow it with fstat.
This shuts up Coverity's complaint about TOC/TOU violation.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Michael Tokarev <mjt@tls.msk.ru>
This commit is contained in:
Paolo Bonzini 2017-01-04 16:05:25 +01:00 committed by Michael Tokarev
parent ece9086eb5
commit 9ed2690354
1 changed files with 8 additions and 8 deletions
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16
hw/i386/pci-assign-load-rom.c
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@ -39,19 +39,19 @@ void *pci_assign_dev_load_option_rom(PCIDevice *dev, struct Object *owner,
"/sys/bus/pci/devices/%04x:%02x:%02x.%01x/rom",
domain, bus, slot, function);
if (stat(rom_file, &st)) {
if (errno != ENOENT) {
error_report("pci-assign: Invalid ROM.");
}
return NULL;
}
/* Write "1" to the ROM file to enable it */
fp = fopen(rom_file, "r+");
if (fp == NULL) {
error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
if (errno != ENOENT) {
error_report("pci-assign: Cannot open %s: %s", rom_file, strerror(errno));
}
return NULL;
}
if (fstat(fileno(fp), &st) == -1) {
error_report("pci-assign: Cannot stat %s: %s", rom_file, strerror(errno));
goto close_rom;
}
val = 1;
if (fwrite(&val, 1, 1, fp) != 1) {
goto close_rom;