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spapr_nvram: Check return value from blk_getlength() 

The blk_getlength() function can return an error value if the
image size cannot be determined. Check for this rather than
ploughing on and trying to g_malloc0() a negative number.
(Spotted by Coverity, CID 1288484.)

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Peter Maydell 2017-06-05 16:14:17 +01:00 committed by David Gibson
parent 60694bc678
commit 0524951788
1 changed files with 9 additions and 1 deletions
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10
hw/nvram/spapr_nvram.c
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@ -144,7 +144,15 @@ static void spapr_nvram_realize(VIOsPAPRDevice *dev, Error **errp)
int ret;
if (nvram->blk) {
nvram->size = blk_getlength(nvram->blk);
int64_t len = blk_getlength(nvram->blk);
if (len < 0) {
error_setg_errno(errp, -len,
"could not get length of backing image");
return;
}
nvram->size = len;
ret = blk_set_perm(nvram->blk,
BLK_PERM_CONSISTENT_READ | BLK_PERM_WRITE,