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9pfs fixes for QEMU 4.2 

This fixes a potential QEMU crash if the underlying filesystem returns
 a null block size in statfs().
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Merge remote-tracking branch 'remotes/gkurz/tags/9p-fix-2019-11-23' into staging

9pfs fixes for QEMU 4.2

This fixes a potential QEMU crash if the underlying filesystem returns
a null block size in statfs().

# gpg: Signature made Sat 23 Nov 2019 15:19:36 GMT
# gpg:                using RSA key B4828BAF943140CEF2A3491071D4D5E5822F73D6
# gpg: Good signature from "Greg Kurz <groug@kaod.org>" [full]
# gpg:                 aka "Gregory Kurz <gregory.kurz@free.fr>" [full]
# gpg:                 aka "[jpeg image of size 3330]" [full]
# Primary key fingerprint: B482 8BAF 9431 40CE F2A3  4910 71D4 D5E5 822F 73D6

* remotes/gkurz/tags/9p-fix-2019-11-23:
  9pfs: Fix divide by zero bug

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2019-11-25 13:39:45 +00:00
parent 2061735ff0 68d654daee
commit 122e6d2a9c
1 changed files with 4 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
hw/9pfs/9p.c
View File

@ -1834,8 +1834,10 @@ static int32_t coroutine_fn get_iounit(V9fsPDU *pdu, V9fsPath *path)
* and as well as less than (client msize - P9_IOHDRSZ))
*/
if (!v9fs_co_statfs(pdu, path, &stbuf)) {
iounit = stbuf.f_bsize;
iounit *= (s->msize - P9_IOHDRSZ)/stbuf.f_bsize;
if (stbuf.f_bsize) {
iounit = stbuf.f_bsize;
iounit *= (s->msize - P9_IOHDRSZ) / stbuf.f_bsize;
}
}
if (!iounit) {
iounit = s->msize - P9_IOHDRSZ;