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authorJames Bates <james.h.bates@gmail.com>2013-10-02 18:43:39 +0200
committerTomi Valkeinen <tomi.valkeinen@ti.com>2013-10-29 12:41:46 +0200
commit55aa42f2e690157e254a6a6989f5f4ac928b35c8 (patch)
treed3fcbcc20f2a6e167335dab8ceaeb5bdc23fa41b /drivers/video/efifb.c
parente8ddb0cfa18dfa4d85d6c420c967850d430b07c6 (diff)
efifb: prevent null-deref when iterating dmi_list
The dmi_list array is initialized using gnu designated initializers, and therefore may contain fewer explicitly defined entries as there are elements in it. This is because the enum above with M_xyz constants contains more items than the designated initializer. Those elements not explicitly initialized are implicitly set to 0. Now efifb_setup() loops through all these array elements, and performs a strcmp on each item. For non explicitly initialized elements this will be a null pointer: This patch swaps the check order in the if statement, thus checks first whether dmi_list[i].base is null. Signed-off-by: James Bates <james.h.bates@gmail.com> Signed-off-by: David Herrmann <dh.herrmann@gmail.com> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
Diffstat (limited to 'drivers/video/efifb.c')
-rw-r--r--drivers/video/efifb.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
index 7f9ff75d0db2..fcb950031246 100644
--- a/drivers/video/efifb.c
+++ b/drivers/video/efifb.c
@@ -108,8 +108,8 @@ static int efifb_setup(char *options)
if (!*this_opt) continue;
for (i = 0; i < M_UNKNOWN; i++) {
- if (!strcmp(this_opt, efifb_dmi_list[i].optname) &&
- efifb_dmi_list[i].base != 0) {
+ if (efifb_dmi_list[i].base != 0 &&
+ !strcmp(this_opt, efifb_dmi_list[i].optname)) {
screen_info.lfb_base = efifb_dmi_list[i].base;
screen_info.lfb_linelength = efifb_dmi_list[i].stride;
screen_info.lfb_width = efifb_dmi_list[i].width;