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viced cap fetchdata len to avoid negative

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when trying to read from a short or zero length file,
it's possible for sanity checking to knock the length below
zero. set a floor at zero.

Reviewed-on: http://gerrit.openafs.org/494
Reviewed-by: Jeffrey Altman <jaltman@openafs.org>
Tested-by: Derrick Brashear <shadow@dementia.org>
Reviewed-by: Derrick Brashear <shadow@dementia.org>
This commit is contained in:
Derrick Brashear 2009-09-25 03:15:40 -04:00 committed by Derrick Brashear
parent bc6559d62c
commit 529d487d65
1 changed files with 3 additions and 2 deletions
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5
src/viced/afsfileprocs.c
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@ -7027,8 +7027,9 @@ FetchData_RXStyle(Volume * volptr, Vnode * targetptr,
Len = 0; Len = 0;
} }
if (Pos + Len > tlen) if (Pos + Len > tlen) /* get length we should send */
Len = tlen - Pos; /* get length we should send */ Len = ((tlen - Pos) < 0) ? 0 : tlen - Pos;
(void)FDH_SEEK(fdP, Pos, 0); (void)FDH_SEEK(fdP, Pos, 0);
{ {
afs_int32 high, low; afs_int32 high, low;