diff options
Diffstat (limited to 'meta/recipes-bsp/grub/files/0021-zfs-Fix-possible-negative-shift-operation.patch')
-rw-r--r-- | meta/recipes-bsp/grub/files/0021-zfs-Fix-possible-negative-shift-operation.patch | 42 |
1 files changed, 42 insertions, 0 deletions
diff --git a/meta/recipes-bsp/grub/files/0021-zfs-Fix-possible-negative-shift-operation.patch b/meta/recipes-bsp/grub/files/0021-zfs-Fix-possible-negative-shift-operation.patch new file mode 100644 index 0000000000..12418858f9 --- /dev/null +++ b/meta/recipes-bsp/grub/files/0021-zfs-Fix-possible-negative-shift-operation.patch @@ -0,0 +1,42 @@ +From c757779e5d09719666c3b155afd2421978a107bd Mon Sep 17 00:00:00 2001 +From: Darren Kenny <darren.kenny@oracle.com> +Date: Tue, 24 Nov 2020 16:41:49 +0000 +Subject: [PATCH] zfs: Fix possible negative shift operation + +While it is possible for the return value from zfs_log2() to be zero +(0), it is quite unlikely, given that the previous assignment to blksz +is shifted up by SPA_MINBLOCKSHIFT (9) before 9 is subtracted at the +assignment to epbs. + +But, while unlikely during a normal operation, it may be that a carefully +crafted ZFS filesystem could result in a zero (0) value to the +dn_datalbkszsec field, which means that the shift left does nothing +and assigns zero (0) to blksz, resulting in a negative epbs value. + +Fixes: CID 73608 + +Signed-off-by: Darren Kenny <darren.kenny@oracle.com> +Reviewed-by: Daniel Kiper <daniel.kiper@oracle.com> + +Upstream-Status: Backport [https://git.savannah.gnu.org/cgit/grub.git/commit/?id=a02091834d3e167320d8a262ff04b8e83c5e616d] +Signed-off-by: Marta Rybczynska <marta.rybczynska@huawei.com> +--- + grub-core/fs/zfs/zfs.c | 5 +++++ + 1 file changed, 5 insertions(+) + +diff --git a/grub-core/fs/zfs/zfs.c b/grub-core/fs/zfs/zfs.c +index 36d0373..0c42cba 100644 +--- a/grub-core/fs/zfs/zfs.c ++++ b/grub-core/fs/zfs/zfs.c +@@ -2667,6 +2667,11 @@ dnode_get (dnode_end_t * mdn, grub_uint64_t objnum, grub_uint8_t type, + blksz = grub_zfs_to_cpu16 (mdn->dn.dn_datablkszsec, + mdn->endian) << SPA_MINBLOCKSHIFT; + epbs = zfs_log2 (blksz) - DNODE_SHIFT; ++ ++ /* While this should never happen, we should check that epbs is not negative. */ ++ if (epbs < 0) ++ epbs = 0; ++ + blkid = objnum >> epbs; + idx = objnum & ((1 << epbs) - 1); + |