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btrfs-progs: fix double free during scanning

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If there are different devices mounted to the same directory we can run
into double free issue in the scanning code and this can lead to a
crash. The dev_info_arg buffer allocation get_fs_info might be skipped,
eg. if the FS_INFO ioctl fails due to EPERM in older kernels. Reset the
pointer before each loop starts.

Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
David Sterba 2015-10-02 17:21:12 +02:00
parent afe33bc29b
commit 1491d246c4
1 changed files with 2 additions and 0 deletions
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2
cmds-filesystem.c
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@ -481,6 +481,7 @@ static int btrfs_scan_kernel(void *search, unsigned unit_mode)
if (search && !match_search_item_kernel(fs_info_arg.fsid,
mnt->mnt_dir, label, search)) {
kfree(dev_info_arg);
dev_info_arg = NULL;
continue;
}
@ -496,6 +497,7 @@ static int btrfs_scan_kernel(void *search, unsigned unit_mode)
if (fd != -1)
close(fd);
kfree(dev_info_arg);
dev_info_arg = NULL;
}
out: