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qemu: avoid text monitor null deref

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Detected by Coverity.  If, for some reason, our text monitor input
does not match our assumptions, we end up incrementing p while it
is NULL, then dereferencing the pointer 0x1, which will fault.

* src/qemu/qemu_monitor_text.c
(qemuMonitorTextGetBlockStatsParamsNumber): Rewrite to avoid
deref of strchr failure.  Fix indentation.
This commit is contained in:
Eric Blake 2011-10-12 18:19:28 -06:00
parent ce521f242a
commit 60be9e8c0e
1 changed files with 15 additions and 18 deletions
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7
src/qemu/qemu_monitor_text.c
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@ -1036,9 +1036,8 @@ int qemuMonitorTextGetBlockStatsParamsNumber(qemuMonitorPtr mon,
* "floppy0: ")
*/
p = strchr(p, ' ');
p++;
while (*p) {
while (p && p < eol) {
if (STRPREFIX (p, " rd_bytes=") ||
STRPREFIX (p, " wr_bytes=") ||
STRPREFIX (p, " rd_operations=") ||
@ -1053,9 +1052,7 @@ int qemuMonitorTextGetBlockStatsParamsNumber(qemuMonitorPtr mon,
}
/* Skip to next label. */
p = strchr (p, ' ');
if (!p || p >= eol) break;
p++;
p = strchr(p + 1, ' ');
}
*nparams = num;