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MFC r281928:

Browse Source 
Avoid an infinite loop by ensuring that the amount of bytes read is greater
than 0 in MDXFileChunk when calculating the checksum

This edgecase can be triggered if the file is truncated while the checksum
is being calculated (i.e. the EOF is reached)

Differential Revision: https://reviews.freebsd.org/D2351 (patch by darius)
PR: 196694
Reviewed by: delphij, ngie
Submitted by: Daniel O'Connor <darius@dons.net.au>
Sponsored by: EMC / Isilon Storage Division
This commit is contained in:
Enji Cooper 2015-05-18 10:45:18 +00:00
parent 1846e46c21
commit 5ed1b7dd32
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/stable/10/; revision=283054
1 changed files with 1 additions and 1 deletions
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2
lib/libmd/mdXhl.c
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@ -74,7 +74,7 @@ MDXFileChunk(const char *filename, char *buf, off_t ofs, off_t len)
i = read(f, buffer, sizeof(buffer));
else
i = read(f, buffer, n);
if (i < 0)
if (i <= 0)
break;
MDXUpdate(&ctx, buffer, i);
n -= i;