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authorEric Blake <eblake@redhat.com>2018-06-11 16:39:26 -0500
committerKevin Wolf <kwolf@redhat.com>2018-06-15 14:49:44 +0200
commite0b371ed5e2db079051139136fd0478728b6a58f (patch)
tree6ce6bc328bbd0222525d2ac7ad2b483aabada360 /qemu-img.c
parent91fe7a376ad46e3cc5e82d418aad22173c948a3c (diff)
qemu-img: Fix assert when mapping unaligned raw file
Commit a290f085 exposed a latent bug in qemu-img map introduced during the conversion of block status to be byte-based. Earlier in commit 5e344dd8, the internal interface get_block_status() switched to take byte-based parameters, but still called a sector-based block layer function; as such, rounding was added in the lone caller to obey the contract. However, commit 237d78f8 changed get_block_status() to truly be byte-based, at which point rounding to sector boundaries can result in calling bdrv_block_status() with 'bytes == 0' (a coding error) when the boundary between data and a hole falls mid-sector (true for the past-EOF implicit hole present in POSIX files). Fix things by removing the rounding that is now no longer necessary. See also https://bugzilla.redhat.com/1589738 Fixes: 237d78f8 Reported-by: Dan Kenigsberg <danken@redhat.com> Reported-by: Nir Soffer <nsoffer@redhat.com> Reported-by: Maor Lipchuk <mlipchuk@redhat.com> CC: qemu-stable@nongnu.org Signed-off-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Diffstat (limited to 'qemu-img.c')
-rw-r--r--qemu-img.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/qemu-img.c b/qemu-img.c
index 1dcdd47254..e1a506f7f6 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2906,7 +2906,7 @@ static int img_map(int argc, char **argv)
int64_t n;
/* Probe up to 1 GiB at a time. */
- n = QEMU_ALIGN_DOWN(MIN(1 << 30, length - offset), BDRV_SECTOR_SIZE);
+ n = MIN(1 << 30, length - offset);
ret = get_block_status(bs, offset, n, &next);
if (ret < 0) {