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Fix coverity defects: 147480, 147584

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CID 147480: Logically dead code (DEADCODE)

Remove non-null check and subsequent function call. Add ASSERT to future
proof the code.

usage label is only jumped to before `zhp` is initialized.

CID 147584: Out-of-bounds access (OVERRUN)

Subtract length of current string from buffer length for `size` argument
to `snprintf`.

Starting address for the write is the start of the buffer + the current
string length. We need to subtract this string length else risk a buffer
overflow.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tobin C. Harding <me@tobin.cc>
Closes #6745
This commit is contained in:
Tobin Harding
2017-10-17 09:32:48 +11:00
committed by Brian Behlendorf
parent 7670f721fc
commit ced28193b0
2 changed files with 5 additions and 6 deletions
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cmd/zdb/zdb.c
+4 -4
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@@ -2001,13 +2001,13 @@ dump_object(objset_t *os, uint64_t object, int verbosity, int *print_header,
aux[0] = '\0';
if (doi.doi_checksum != ZIO_CHECKSUM_INHERIT || verbosity >= 6) {
(void) snprintf(aux + strlen(aux), sizeof (aux), " (K=%s)",
ZDB_CHECKSUM_NAME(doi.doi_checksum));
(void) snprintf(aux + strlen(aux), sizeof (aux) - strlen(aux),
" (K=%s)", ZDB_CHECKSUM_NAME(doi.doi_checksum));
}
if (doi.doi_compress != ZIO_COMPRESS_INHERIT || verbosity >= 6) {
(void) snprintf(aux + strlen(aux), sizeof (aux), " (Z=%s)",
ZDB_COMPRESS_NAME(doi.doi_compress));
(void) snprintf(aux + strlen(aux), sizeof (aux) - strlen(aux),
" (Z=%s)", ZDB_COMPRESS_NAME(doi.doi_compress));
}
(void) printf("%10lld %3u %5s %5s %5s %6s %5s %6s %s%s\n",