@@ -40,6 +40,9 @@ errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
fs->block_map = 0;
fs->badblocks = 0;
fs->dblist = 0;
+ fs->mmp_buf = 0;
+ fs->mmp_cmp = 0;
+ fs->mmp_fd = -1;
io_channel_bumpcount(fs->io);
if (fs->icache)
@@ -87,6 +90,28 @@ errcode_t ext2fs_dup_handle(ext2_filsys src, ext2_filsys *dest)
if (retval)
goto errout;
}
+ if (src->mmp_buf) {
+ retval = ext2fs_get_mem(src->blocksize, &fs->mmp_buf);
+ if (retval)
+ goto errout;
+ memcpy(fs->mmp_buf, src->mmp_buf, src->blocksize);
+ }
+ if (src->mmp_fd >= 0) {
+ fs->mmp_fd = dup(src->mmp_fd);
+ if (fs->mmp_fd < 0) {
+ retval = EXT2_ET_MMP_OPEN_DIRECT;
+ goto errout;
+ }
+ }
+ if (src->mmp_cmp) {
+ int align = ext2fs_get_dio_alignment(src->mmp_fd);
+
+ retval = ext2fs_get_memalign(src->blocksize, align,
+ &fs->mmp_cmp);
+ if (retval)
+ goto errout;
+ memcpy(fs->mmp_cmp, src->mmp_cmp, src->blocksize);
+ }
*dest = fs;
return 0;
errout:
It turns out that resize2fs uses ext2fs_dup_handle to duplicate fs handles. If MMP is enabled, this causes both handles to share MMP buffers, which is bad news when it comes time to free both handles. Change the code to (we hope) fix this. This prevents resize2fs from failing with a double-free error when handed a MMP filesystem. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> --- lib/ext2fs/dupfs.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html