tree f541031a6b025c40817ae3e1d1178467cf856690
parent 2c25b8131631c39145fe1f5b7745943e0e0c0406
author Kevin Wolf <mail@kevin-wolf.de> 1284114422 +0200
committer Kevin Wolf <kwolf@redhat.com> 1284381296 +0200

vvfat: Fix segfault on write to read-only disk

vvfat tries to set the readonly flag in its open function, but nowadays
this is overwritted with the readonly=... command line option. Check in
bdrv_write if the vvfat was opened read-only and return an error in this
case.

Without this check, vvfat tries to access the qcow bs, which is NULL
without enabled write support.

Signed-off-by: Kevin Wolf <mail@kevin-wolf.de>
(cherry picked from commit bfd0049440f53745d31eb93c208f0f3ab6308027)