Commit a513d869 authored Jan 20, 2016 by Jan Kara Committed by Linus Torvalds Jan 20, 2016

fat: allow time_offset to be up to 24 hours



Currently we limit values of time_offset mount option to be between -12
and 12 hours.  However e.g.  zone GMT+12 can have a DST correction on top
which makes the total time difference 13 hours.  Update the checks in
mount option parsing to allow offset of upto 24 hours to allow for unusual
cases.

Signed-off-by: Jan Kara <jack@suse.cz>
Reported-by: Volker Kuhlmann <list0570@paradise.net.nz>
Acked-by: OGAWA Hirofumi <hirofumi@mail.parknet.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

parent 2c35dea2

fs/fat/inode.c

+6 −1

Original line number	Diff line number	Diff line
		@@ -1146,7 +1146,12 @@ static int parse_options(struct super_block sb, char options, int is_vfat,
		case Opt_time_offset:
		if (match_int(&args[0], &option))
		return -EINVAL;
		if (option < -12 * 60 \|\| option > 12 * 60)
		/*
		* GMT+-12 zones may have DST corrections so at least
		* 13 hours difference is needed. Make the limit 24
		* just in case someone invents something unusual.
		*/
		if (option < -24 * 60 \|\| option > 24 * 60)
		return -EINVAL;
		opts->tz_set = 1;
		opts->time_offset = option;

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