fbdev: offb: Fix OF node name handling

Commit 5c63e407aaab ("fbdev: Convert to using %pOFn instead of
device_node.name") changed how the OF FB driver handles the OF node
name. This missed the case where the node name is passed to
offb_init_palette_hacks(). This results in a NULL ptr dereference
in strncmp and breaks any system except ones using bootx with no display
node.

Fix this by making offb_init_palette_hacks() use the OF node pointer and
use of_node_name_prefix() helper function instead for node name
comparisons. This helps in moving all OF node name accesses to helper
functions in preparation to remove struct device_node.name pointer.

Fixes: 5c63e407aaab ("fbdev: Convert to using %pOFn instead of device_node.name")
Reported-by: Mathieu Malaterre <malat@debian.org>
Tested-by: Mathieu Malaterre <malat@debian.org>
Cc: stable@vger.kernel.org # v4.19+
Cc: Elimar Riesebieter <riesebie@lxtec.de>
Signed-off-by: Rob Herring <robh@kernel.org>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>

1 files changed, 9 insertions, 9 deletions

diff --git a/drivers/video/fbdev/offb.c b/drivers/video/fbdev/offb.c
index 31f769d67195..057d3cdef92e 100644
--- a/drivers/video/fbdev/offb.c
+++ b/drivers/video/fbdev/offb.c
@@ -318,28 +318,28 @@ static void __iomem *offb_map_reg(struct device_node *np, int index,
 }
 
 static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp,
-                                    const char *name, unsigned long address)
+                                    unsigned long address)
 {
         struct offb_par *par = (struct offb_par *) info->par;
 
-        if (dp && !strncmp(name, "ATY,Rage128", 11)) {
+        if (of_node_name_prefix(dp, "ATY,Rage128")) {
                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
                 if (par->cmap_adr)
                         par->cmap_type = cmap_r128;
-        } else if (dp && (!strncmp(name, "ATY,RageM3pA", 12)
-                          || !strncmp(name, "ATY,RageM3p12A", 14))) {
+        } else if (of_node_name_prefix(dp, "ATY,RageM3pA") ||
+                   of_node_name_prefix(dp, "ATY,RageM3p12A")) {
                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
                 if (par->cmap_adr)
                         par->cmap_type = cmap_M3A;
-        } else if (dp && !strncmp(name, "ATY,RageM3pB", 12)) {
+        } else if (of_node_name_prefix(dp, "ATY,RageM3pB")) {
                 par->cmap_adr = offb_map_reg(dp, 2, 0, 0x1fff);
                 if (par->cmap_adr)
                         par->cmap_type = cmap_M3B;
-        } else if (dp && !strncmp(name, "ATY,Rage6", 9)) {
+        } else if (of_node_name_prefix(dp, "ATY,Rage6")) {
                 par->cmap_adr = offb_map_reg(dp, 1, 0, 0x1fff);
                 if (par->cmap_adr)
                         par->cmap_type = cmap_radeon;
-        } else if (!strncmp(name, "ATY,", 4)) {
+        } else if (of_node_name_prefix(dp, "ATY,")) {
                 unsigned long base = address & 0xff000000UL;
                 par->cmap_adr =
                         ioremap(base + 0x7ff000, 0x1000) + 0xcc0;
@@ -350,7 +350,7 @@ static void offb_init_palette_hacks(struct fb_info *info, struct device_node *dp
                 par->cmap_adr = offb_map_reg(dp, 0, 0x6000, 0x1000);
                 if (par->cmap_adr)
                         par->cmap_type = cmap_gxt2000;
-        } else if (dp && !strncmp(name, "vga,Display-", 12)) {
+        } else if (of_node_name_prefix(dp, "vga,Display-")) {
                 /* Look for AVIVO initialized by SLOF */
                 struct device_node *pciparent = of_get_parent(dp);
                 const u32 *vid, *did;
@@ -438,7 +438,7 @@ static void __init offb_init_fb(const char *name,
 
         par->cmap_type = cmap_unknown;
         if (depth == 8)
-                offb_init_palette_hacks(info, dp, name, address);
+                offb_init_palette_hacks(info, dp, address);
         else
                 fix->visual = FB_VISUAL_TRUECOLOR;