[GHC] #5688: instance Read Integer/Rational/Double readsPrec out of memory and crash due to exponential notation

[GHC]

#5688: instance Read Integer/Rational/Double readsPrec out of memory and crash due
to exponential notation
-------------------------------+--------------------------------------------
  Reporter:  gracjan           |          Owner:                  
      Type:  bug               |         Status:  new             
  Priority:  highest           |      Milestone:  7.6.1           
 Component:  libraries/base    |        Version:  6.12.3          
Resolution:                    |       Keywords:                  
        Os:  Unknown/Multiple  |   Architecture:  Unknown/Multiple
   Failure:  Runtime crash     |     Difficulty:  Unknown         
  Testcase:                    |      Blockedby:                  
  Blocking:                    |        Related:                  
-------------------------------+--------------------------------------------

Comment(by igloo):

 Replying to [comment:33 iustin]:
 > Replying to [comment:31 igloo]:
 > > This isn't a regression, so let's punt it to 7.6.
 >
 > It's not a regression, but IMHO it's a security bug.

 I don't think a DoS is as bad a problem as the phrase "security bug"
 implies.

 > As such, it should be fixed even in lower versions, not only in a future
 one!

 We're not set up to be able to make releases on old branches.

 > I might overreact (sorry) but dragging the feet on such issues make it
 hard to promote the use of Haskell…

 Well, pragmatically speaking, currently we're past the feature freeze and
 into the RC phase (so ideally wouldn't be changing the definition of `Read
 Integer` etc), the release is already long overdue, and we don't have a
 good fix yet.

-- 
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5688#comment:34>
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