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hw/9pfs: Fix segfault with 9p2000.u 

When guest tries to chmod a block or char device file over 9pfs,
the qemu process segfaults. With 9p2000.u protocol we use wstat to
change mode bits and client don't send extension information for
chmod. We need to check for size field to check whether extension
info is present or not.

Reported-by: Michael Tokarev <mjt@tls.msk.ru>
Acked-by: Michael Tokarev <mjt@tls.msk.ru>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
This commit is contained in:
Aneesh Kumar K.V 2013-05-20 11:29:52 +05:30
parent 371386fb60
commit c7e587b73e
1 changed files with 1 additions and 1 deletions
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2
hw/9pfs/virtio-9p.c
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@ -658,7 +658,7 @@ static mode_t v9mode_to_mode(uint32_t mode, V9fsString *extension)
ret |= S_IFIFO;
}
if (mode & P9_STAT_MODE_DEVICE) {
if (extension && extension->data[0] == 'c') {
if (extension->size && extension->data[0] == 'c') {
ret |= S_IFCHR;
} else {
ret |= S_IFBLK;