From 052495178821fdc97b4125a8677c1b68eb458db9 Mon Sep 17 00:00:00 2001 From: Peter Maydell Date: Mon, 5 Jun 2017 16:14:17 +0100 Subject: 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 Signed-off-by: David Gibson --- hw/nvram/spapr_nvram.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) (limited to 'hw') diff --git a/hw/nvram/spapr_nvram.c b/hw/nvram/spapr_nvram.c index aa5d2c1f5f..bc355a4348 100644 --- a/hw/nvram/spapr_nvram.c +++ b/hw/nvram/spapr_nvram.c @@ -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, -- cgit v1.2.3