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Fortuna: fix a correctness issue in reseed (fortuna_pre_read)

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'i' counts the number of pools included in the array 's'.  Passing 'i+1' to
reseed_internal() as the number of blocks in 's' is a bogus overrun of the
initialized portion of 's' -- technically UB.

I found this via code inspection, referencing §9.5.2 "Pools" of the Fortuna
chapter, but I would expect Coverity to notice the same issue.
Unfortunately, it doesn't appear to.

Reviewed by:	markm
Approved by:	secteam (gordon)
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D16985
This commit is contained in:
Conrad Meyer 2018-10-26 20:55:01 +00:00
parent 070249043e
commit 9a88479843
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=339788
1 changed files with 1 additions and 1 deletions
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2
sys/dev/random/fortuna.c
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@ -408,7 +408,7 @@ random_fortuna_pre_read(void)
SDT_PROBE2(random, fortuna, event_processor, debug, fortuna_state.fs_reseedcount, fortuna_state.fs_pool);
#endif
/* FS&K */
random_fortuna_reseed_internal(s, i < RANDOM_FORTUNA_NPOOLS ? i + 1 : RANDOM_FORTUNA_NPOOLS);
random_fortuna_reseed_internal(s, i);
/* Clean up and secure */
explicit_bzero(s, sizeof(s));
explicit_bzero(temp, sizeof(temp));