c/mirror_zfs
1
0
Fork 0
mirror of https://git.proxmox.com/git/mirror_zfs.git synced 2026-05-25 19:57:43 +03:00
Code Issues Packages Projects Releases Wiki Activity

fix: Shift exponent too large

Browse Source 
Undefined operation is reported by running ztest (or zloop) compiled with GCC
UndefinedBehaviorSanitizer. Error only happens on top level of dnode indirection
with large enough offset values. Logically, left shift operation would work,
but bit shift semantics in C, and limitation of uint64_t, do not produce desired
result.

Issue #5059, #4883

Signed-off-by: Gvozden Neskovic <neskovic@gmail.com>
This commit is contained in:
Gvozden Neskovic
2016-08-31 10:12:08 +02:00
committed by Brian Behlendorf
parent 0b78aeae92
commit 031d7c2fe6
5 changed files with 38 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/dnode.h
+2 -3
View File
@@ -104,9 +104,8 @@ extern "C" {
#define DNODES_PER_LEVEL_SHIFT (DN_MAX_INDBLKSHIFT - SPA_BLKPTRSHIFT)
#define DNODES_PER_LEVEL (1ULL << DNODES_PER_LEVEL_SHIFT)
/* The +2 here is a cheesy way to round up */
#define DN_MAX_LEVELS (2 + ((DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT) / \
(DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT)))
#define DN_MAX_LEVELS (DIV_ROUND_UP(DN_MAX_OFFSET_SHIFT - SPA_MINBLOCKSHIFT, \
DN_MIN_INDBLKSHIFT - SPA_BLKPTRSHIFT) + 1)
#define DN_BONUS(dnp) ((void*)((dnp)->dn_bonus + \
(((dnp)->dn_nblkptr - 1) * sizeof (blkptr_t))))