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mount.nfs segfaults if kernel version number does not contain
at least 3 components delimited with a dot.
Avoid this by matching up to three unsigned integers inialised
to zero, separated by dots.
A version that does not start with an integer is probably a future
version where the versioning evolved to another scheme.
Return UINT_MAX which is guaranteed to be higher than existing
versions. This would also make it possible to easily identify
versions that do not start with an integer.
Signed-off-by: Luk Claes <luk@...>
---
utils/mount/version.h | 16 +++++++++-------
1 files changed, 9 insertions(+), 7 deletions(-)
diff --git a/utils/mount/version.h b/utils/mount/version.h
index af61a6f..531cf68 100644
--- a/utils/mount/version.h
+++ b/utils/mount/version.h
@@ -23,8 +23,8 @@
#ifndef _NFS_UTILS_MOUNT_VERSION_H
#define _NFS_UTILS_MOUNT_VERSION_H
-#include <stdlib.h>
-#include <string.h>
+#include <stdio.h>
+#include <limits.h>
#include <sys/utsname.h>
@@ -37,14 +37,16 @@ static inline unsigned int MAKE_VERSION(unsigned int p, unsigned int q,
static inline unsigned int linux_version_code(void)
{
struct utsname my_utsname;
- unsigned int p, q, r;
+ unsigned int p, q = 0, r = 0;
+ /* UINT_MAX as backward compatibility code should not be run */
if (uname(&my_utsname))
- return 0;
+ return UINT_MAX;
- p = (unsigned int)atoi(strtok(my_utsname.release, "."));
- q = (unsigned int)atoi(strtok(NULL, "."));
- r = (unsigned int)atoi(strtok(NULL, "."));
+ /* UINT_MAX as future versions might not start with an integer */
+ if (sscanf(my_utsname.release, "%u.%u.%u", &p, &q, &r) < 1)
+ return UINT_MAX;
+
return MAKE_VERSION(p, q, r);
}
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