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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>
This commit is contained in:
Kevin Wolf 2010-09-10 12:27:02 +02:00 committed by Kevin Wolf
parent a287916c71
commit ac48e389d0
1 changed files with 5 additions and 0 deletions
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5
block/vvfat.c
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@ -2665,6 +2665,11 @@ static int vvfat_write(BlockDriverState *bs, int64_t sector_num,
DLOG(checkpoint());
/* Check if we're operating in read-only mode */
if (s->qcow == NULL) {
return -EACCES;
}
vvfat_close_current_file(s);
/*