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reiserfs: check kstrdup failure 

Check out-of-memory failure of the kstrdup option. Note that the argument
"arg" may be NULL (in that case kstrup returns NULL), so out of memory
condition happened if arg was non-NULL and kstrdup returned NULL.

The patch also changes the call to replace_mount_options - if we didn't
pass any filesystem-specific options, we don't call replace_mount_options
(thus we don't erase existing reported options).

Note that to properly report options after remount, the reiserfs
filesystem should implement the show_options method. Without the
show_options method, options changed with remount replace existing
options.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Mikulas Patocka 2016-05-24 22:51:27 +02:00 committed by Jan Kara
parent 7888824b0b
commit b9d8905e4a
1 changed files with 7 additions and 2 deletions
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9
fs/reiserfs/super.c
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@ -1393,7 +1393,7 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
unsigned long safe_mask = 0;
unsigned int commit_max_age = (unsigned int)-1;
struct reiserfs_journal *journal = SB_JOURNAL(s);
char *new_opts = kstrdup(arg, GFP_KERNEL);
char *new_opts;
int err;
char *qf_names[REISERFS_MAXQUOTAS];
unsigned int qfmt = 0;
@ -1401,6 +1401,10 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
int i;
#endif
new_opts = kstrdup(arg, GFP_KERNEL);
if (arg && !new_opts)
return -ENOMEM;
sync_filesystem(s);
reiserfs_write_lock(s);
@ -1546,7 +1550,8 @@ static int reiserfs_remount(struct super_block *s, int *mount_flags, char *arg)
}
out_ok_unlocked:
replace_mount_options(s, new_opts);
if (new_opts)
replace_mount_options(s, new_opts);
return 0;
out_err_unlock: