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fat: allow time_offset to be up to 24 hours

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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 <[email protected]>
Reported-by: Volker Kuhlmann <[email protected]>
Acked-by: OGAWA Hirofumi <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Jan Kara 2016-01-20 14:59:35 -08:00 • committed by Linus Torvalds
commit a513d86983
1 changed files with 6 additions and 1 deletions
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7
fs/fat/inode.c
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@ -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;