From 1120407bdf70a2c4681464ae08bdb7c615566200 Mon Sep 17 00:00:00 2001 From: Max Reitz Date: Tue, 30 Jul 2019 13:48:12 +0200 Subject: [PATCH] nvme: Limit blkshift to 12 (for 4 kB blocks) Linux does not support blocks greater than 4 kB anyway, so we might as well limit blkshift to 12 and thus save us from some potential trouble. Reported-by: Peter Maydell Suggested-by: Maxim Levitsky Signed-off-by: Max Reitz Message-id: 20190730114812.10493-1-mreitz@redhat.com Reviewed-by: Maxim Levitsky Coverity: CID 1403771 Signed-off-by: Max Reitz --- block/nvme.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/block/nvme.c b/block/nvme.c index c28755cc31..2c85713519 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -105,7 +105,7 @@ typedef struct { uint64_t nsze; /* Namespace size reported by identify command */ int nsid; /* The namespace id to read/write data. */ - size_t blkshift; + int blkshift; uint64_t max_transfer; bool plugged; @@ -420,7 +420,7 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp) NvmeIdNs *idns; NvmeLBAF *lbaf; uint8_t *resp; - int r, hwsect_size; + int r; uint64_t iova; NvmeCmd cmd = { .opcode = NVME_ADM_CMD_IDENTIFY, @@ -474,11 +474,11 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp) goto out; } - hwsect_size = 1 << lbaf->ds; - - if (hwsect_size < BDRV_SECTOR_SIZE || hwsect_size > s->page_size) { - error_setg(errp, "Namespace has unsupported block size (%d)", - hwsect_size); + if (lbaf->ds < BDRV_SECTOR_BITS || lbaf->ds > 12 || + (1 << lbaf->ds) > s->page_size) + { + error_setg(errp, "Namespace has unsupported block size (2^%d)", + lbaf->ds); goto out; } @@ -804,16 +804,16 @@ static int64_t nvme_getlength(BlockDriverState *bs) return s->nsze << s->blkshift; } -static int64_t nvme_get_blocksize(BlockDriverState *bs) +static uint32_t nvme_get_blocksize(BlockDriverState *bs) { BDRVNVMeState *s = bs->opaque; - assert(s->blkshift >= BDRV_SECTOR_BITS); - return 1 << s->blkshift; + assert(s->blkshift >= BDRV_SECTOR_BITS && s->blkshift <= 12); + return UINT32_C(1) << s->blkshift; } static int nvme_probe_blocksizes(BlockDriverState *bs, BlockSizes *bsz) { - int64_t blocksize = nvme_get_blocksize(bs); + uint32_t blocksize = nvme_get_blocksize(bs); bsz->phys = blocksize; bsz->log = blocksize; return 0; -- 2.11.4.GIT