path: root/common/blspec.c
diff options
authorPhilipp Zabel <>2018-01-18 15:19:30 +0100
committerSascha Hauer <>2018-01-22 08:26:51 +0100
commitc4b3b440cca77dfbcebdf7cb763dc6a6e3c8c15e (patch)
treefe88f53009b98f4ff95390ac016e683d10d3fc7a /common/blspec.c
parent11bc2f40415299028576fb88da1caa8f1561ebe5 (diff)
blspec: fix crash when trying to boot from loop mounts
When trying to boot from a loop mount path, the blspec code passes a NULL pointer to dev_name, because cdev->dev is not set for loop mounts: unable to handle NULL pointer dereference at address 0x00000020 pc : [<4fe09e28>] lr : [<4fe02305>] sp : 4ffef7c0 ip : 31b75c78 fp : 31b6a388 r10: 31b6a368 r9 : 315a4cac r8 : 00000001 r7 : 00000001 r6 : 311b8540 r5 : ffffffea r4 : 31b6a3f8 r3 : 00000000 r2 : 10000000 r1 : 00000001 r0 : 00000000 Flags: nzcv IRQs off FIQs off Mode SVC_32 [<4fe09e28>] (dev_id+0xc/0x38) from [<4fe02305>] (blspec_scan_directory+0x3e1/0x484) [<4fe02305>] (blspec_scan_directory+0x3e1/0x484) from [<4fe02551>] (blspec_bootentry_provider+0x1d/0x3c) [<4fe02551>] (blspec_bootentry_provider+0x1d/0x3c) from [<4fe0984b>] (bootentry_create_from_name+0x23/0xdc) [<4fe0984b>] (bootentry_create_from_name+0x23/0xdc) from [<4fe246f9>] (do_boot+0x95/0x160) [<4fe246f9>] (do_boot+0x95/0x160) from [<4fe032e9>] (execute_command+0x21/0x48) [<4fe032e9>] (execute_command+0x21/0x48) from [<4fe088e3>] (run_list_real+0x56b/0x634) [<4fe088e3>] (run_list_real+0x56b/0x634) from [<4fe08249>] (parse_stream_outer+0xd9/0x164) [<4fe08249>] (parse_stream_outer+0xd9/0x164) from [<4fe08b6d>] (run_shell+0x31/0x60) [<4fe08b6d>] (run_shell+0x31/0x60) from [<4fe032e9>] (execute_command+0x21/0x48) [<4fe032e9>] (execute_command+0x21/0x48) from [<4fe088e3>] (run_list_real+0x56b/0x634) [<4fe088e3>] (run_list_real+0x56b/0x634) from [<4fe085fd>] (run_list_real+0x285/0x634) [<4fe444b9>] (unwind_backtrace+0x1/0x58) from [<4fe00b7d>] (panic+0x1d/0x34) [<4fe00b7d>] (panic+0x1d/0x34) from [<4fe42a75>] (do_exception+0xd/0x10) [<4fe42a75>] (do_exception+0xd/0x10) from [<4fe42ad5>] (do_data_abort+0x21/0x2c) [<4fe42ad5>] (do_data_abort+0x21/0x2c) from [<4fe42394>] (do_abort_6+0x48/0x54) Fix this by checking cdev->dev as well as cdev before calling dev_name. Signed-off-by: Philipp Zabel <> Signed-off-by: Sascha Hauer <>
Diffstat (limited to 'common/blspec.c')
1 files changed, 3 insertions, 2 deletions
diff --git a/common/blspec.c b/common/blspec.c
index b258e66..6171461 100644
--- a/common/blspec.c
+++ b/common/blspec.c
@@ -107,7 +107,8 @@ static int blspec_boot(struct bootentry *be, int verbose, int dryrun)
pr_info("booting %s from %s\n", blspec_entry_var_get(entry, "title"),
- entry->cdev ? dev_name(entry->cdev->dev) : "none");
+ (entry->cdev && entry->cdev->dev) ?
+ dev_name(entry->cdev->dev) : "none");
ret = bootm_boot(&data);
if (ret)
@@ -505,7 +506,7 @@ int blspec_scan_directory(struct bootentries *bootentries, const char *root)
- if (entry->cdev) {
+ if (entry->cdev && entry->cdev->dev) {
devname = xstrdup(dev_name(entry->cdev->dev));
if (entry->cdev->dev->parent)
hwdevname = xstrdup(dev_name(entry->cdev->dev->parent));