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authorSrivatsa S. Bhat <srivatsa@csail.mit.edu>2018-02-05 18:25:09 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-03-15 17:59:24 +0100
commit652d703b21eb1caf2673c10bd58e4b0121dc7c50 (patch)
treed914ae0c37d7f73dd296d1a228503489ea903913 /fs/char_dev.c
parentbd329f028f1cd51c7623c326147af07c6d832193 (diff)
char_dev: Fix off-by-one bugs in find_dynamic_major()
CHRDEV_MAJOR_DYN_END and CHRDEV_MAJOR_DYN_EXT_END are valid major numbers. So fix the loop iteration to include them in the search for free major numbers. While at it, also remove a redundant if condition ("cd->major != i"), as it will never be true. Signed-off-by: Srivatsa S. Bhat <srivatsa@csail.mit.edu> Reviewed-by: Logan Gunthorpe <logang@deltatee.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/char_dev.c')
-rw-r--r--fs/char_dev.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/char_dev.c b/fs/char_dev.c
index a65e4a56318c..33c938542160 100644
--- a/fs/char_dev.c
+++ b/fs/char_dev.c
@@ -67,18 +67,18 @@ static int find_dynamic_major(void)
int i;
struct char_device_struct *cd;
- for (i = ARRAY_SIZE(chrdevs)-1; i > CHRDEV_MAJOR_DYN_END; i--) {
+ for (i = ARRAY_SIZE(chrdevs)-1; i >= CHRDEV_MAJOR_DYN_END; i--) {
if (chrdevs[i] == NULL)
return i;
}
for (i = CHRDEV_MAJOR_DYN_EXT_START;
- i > CHRDEV_MAJOR_DYN_EXT_END; i--) {
+ i >= CHRDEV_MAJOR_DYN_EXT_END; i--) {
for (cd = chrdevs[major_to_index(i)]; cd; cd = cd->next)
if (cd->major == i)
break;
- if (cd == NULL || cd->major != i)
+ if (cd == NULL)
return i;
}