[PATCH] xfsprogs: check for size parsing errors in xfs_quota

From: Eric Sandeen <sandeen@redhat.com>
To: xfs-oss <xfs@oss.sgi.com>
Cc: James Lawrie <james@jdlawrie.co.uk>
Subject: [PATCH] xfsprogs: check for size parsing errors in xfs_quota
Date: Mon, 23 Jan 2012 11:31:53 -0600	[thread overview]
Message-ID: <4F1D9989.8060808@redhat.com> (raw)

Doing something like 

# xfs_quota -x -c 'limit -u bhard=1.2g ...

will cause cvtnum to fail and return a value of -1LL (because it
cannot parse the decimal), but the quota caller doesn't check
for this error value, casts it to U64, shifts right, and we end
up with an answer of 16 petabytes rather than erroring out.
Fix this.

Reported-by: James Lawrie <james@jdlawrie.co.uk>
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---

diff --git a/quota/edit.c b/quota/edit.c
index b704e63..067cd63 100644
--- a/quota/edit.c
+++ b/quota/edit.c
@@ -226,13 +226,17 @@ extractb(
 	uint		sectorsize,
 	__uint64_t	*value)
 {
-	__uint64_t	v;
+	long long	v;
 	char		*s = string;
 
 	if (strncmp(string, prefix, length) == 0) {
 		s = string + length + 1;
-		v = (__uint64_t)cvtnum(blocksize, sectorsize, s);
-		*value = v >> 9;	/* syscalls use basic blocks */
+		v = cvtnum(blocksize, sectorsize, s);
+		if (v == -1LL) {
+			fprintf(stderr, _("%s: Error: could not parse size %s.\n"), progname, s);
+			return 0;
+		}
+		*value = (__uint64_t)v >> 8;	/* syscalls use basic blocks */
 		if (v > 0 && *value == 0)
 			fprintf(stderr, _("%s: Warning: `%s' in quota blocks is 0 (unlimited).\n"), progname, s);
 		return 1;

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