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| author | Peter Eisentraut <peter_e@gmx.net> | 2016-08-08 11:12:59 -0400 |
|---|---|---|
| committer | Peter Eisentraut <peter_e@gmx.net> | 2016-08-08 11:13:51 -0400 |
| commit | d555d26429568e1a95f75c1a751933ebb63b82c6 (patch) | |
| tree | 6165ea79e9b47a394b407d7308238b983d3d060b | |
| parent | 5b1da944c3026bb253f0700a758b5db3db06a223 (diff) | |
| download | postgresql-d555d26429568e1a95f75c1a751933ebb63b82c6.tar.gz postgresql-d555d26429568e1a95f75c1a751933ebb63b82c6.zip | |
Fix several one-byte buffer over-reads in to_number
Several places in NUM_numpart_from_char(), which is called from the SQL
function to_number(text, text), could accidentally read one byte past
the end of the input buffer (which comes from the input text datum and
is not null-terminated).
1. One leading space character would be skipped, but there was no check
that the input was at least one byte long. This does not happen in
practice, but for defensiveness, add a check anyway.
2. Commit 4a3a1e2cf apparently accidentally doubled that code that skips
one space character (so that two spaces might be skipped), but there
was no overflow check before skipping the second byte. Fix by
removing that duplicate code.
3. A logic error would allow a one-byte over-read when looking for a
trailing sign (S) placeholder.
In each case, the extra byte cannot be read out directly, but looking at
it might cause a crash.
The third item was discovered by Piotr Stefaniak, the first two were
found and analyzed by Tom Lane and Peter Eisentraut.
| -rw-r--r-- | src/backend/utils/adt/formatting.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/src/backend/utils/adt/formatting.c b/src/backend/utils/adt/formatting.c index 06a3e5fb237..54368246110 100644 --- a/src/backend/utils/adt/formatting.c +++ b/src/backend/utils/adt/formatting.c @@ -4119,12 +4119,12 @@ NUM_numpart_from_char(NUMProc *Np, int id, int input_len) (id == NUM_0 || id == NUM_9) ? "NUM_0/9" : id == NUM_DEC ? "NUM_DEC" : "???"); #endif - if (*Np->inout_p == ' ') - Np->inout_p++; - #define OVERLOAD_TEST (Np->inout_p >= Np->inout + input_len) #define AMOUNT_TEST(_s) (input_len-(Np->inout_p-Np->inout) >= _s) + if (OVERLOAD_TEST) + return; + if (*Np->inout_p == ' ') Np->inout_p++; @@ -4274,7 +4274,7 @@ NUM_numpart_from_char(NUMProc *Np, int id, int input_len) * next char is not digit */ if (IS_LSIGN(Np->Num) && isread && - (Np->inout_p + 1) <= Np->inout + input_len && + (Np->inout_p + 1) < Np->inout + input_len && !isdigit((unsigned char) *(Np->inout_p + 1))) { int x; |