malloc failures in java/util/zip/Deflater (original) (raw)

David Holmes - Sun Microsystems David.Holmes at Sun.COM
Wed Jul 8 23:48:10 UTC 2009

Hi Mario,

I'm not familiar with this particular code but doesn't a value of this_len==0 imply that there's nothing to do and a whole chunk of code here can be skipped? Is finding this_len==0 even valid here?

Your patch fixes your problem, but it seems to me the code either shouldn't get this_len==0 or else should be handling it differently.

Cheers, David Holmes

Mario Torre said the following on 07/09/09 03:59:

Hi all,

I've found a problem in the Deflater code in OpenJDK, where a length of zero bytes is passed to malloc. According to the specs, malloc may return either a valid pointer that can be passed to free, or NULL, while generally NULL is considered to be a failure. Linux and Solaris, albeit non specifying it, return always a valid pointer, as far as I know, but I have a weird OS here that does indeed return NULL. I've fixed this issue locally, and thought I could share the patch with you: http://cr.openjdk.java.net/~neugens/deflater/webrev.00/ Cheers, Mario

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