[Qemu-devel] [PATCH V2] qemu-img: avoid overflow of min_sparse parameter

[Peter Lieven <pl@kamp.de>]

the min_sparse convert parameter can overflow (e.g. -S 1024G)
in the conversion from int64_t to int resulting in a negative
min_sparse parameter. Avoid this by limiting the valid parameters
to sane values. In fact anything exceeding the convert buffer size
is also pointless. While at it also forbid values that are non
multiple of 512 to avoid undesired behaviour. For instance, values
between 1 and 511 were legal, but resulted in full allocation.

Cc: qemu-stable@nongnu.org
Signed-off-by: Peter Lieven <pl@kamp.de>
---
V1->V2: - use correct check for sval mod 512 == 0
        - use BDRV_SECTOR_SIZE macro instead of hardcoded 512

 qemu-img.c | 16 +++++++++++-----
 1 file changed, 11 insertions(+), 5 deletions(-)

diff --git a/qemu-img.c b/qemu-img.c
index 4a7ce43..9b7506b 100644
--- a/qemu-img.c
+++ b/qemu-img.c
@@ -2005,6 +2005,8 @@ static int convert_do_copy(ImgConvertState *s)
     return s->ret;
 }
 
+#define MAX_BUF_SECTORS 32768
+
 static int img_convert(int argc, char **argv)
 {
     int c, bs_i, flags, src_flags = 0;
@@ -2100,8 +2102,12 @@ static int img_convert(int argc, char **argv)
             int64_t sval;
 
             sval = cvtnum(optarg);
-            if (sval < 0) {
-                error_report("Invalid minimum zero buffer size for sparse output specified");
+            if (sval < 0 || sval & (BDRV_SECTOR_SIZE - 1) ||
+                sval / BDRV_SECTOR_SIZE > MAX_BUF_SECTORS) {
+                error_report("Invalid buffer size for sparse output specified. "
+                    "Valid sizes are multiples of %llu up to %llu. Select "
+                    "0 to disable sparse detection (fully allocates output).",
+                    BDRV_SECTOR_SIZE, MAX_BUF_SECTORS * BDRV_SECTOR_SIZE);
                 goto fail_getopt;
             }
 
@@ -2385,9 +2391,9 @@ static int img_convert(int argc, char **argv)
     }
 
     /* increase bufsectors from the default 4096 (2M) if opt_transfer
-     * or discard_alignment of the out_bs is greater. Limit to 32768 (16MB)
-     * as maximum. */
-    s.buf_sectors = MIN(32768,
+     * or discard_alignment of the out_bs is greater. Limit to
+     * MAX_BUF_SECTORS as maximum which is currently 32768 (16MB). */
+    s.buf_sectors = MIN(MAX_BUF_SECTORS,
                         MAX(s.buf_sectors,
                             MAX(out_bs->bl.opt_transfer >> BDRV_SECTOR_BITS,
                                 out_bs->bl.pdiscard_alignment >>
-- 
2.7.4