summaryrefslogtreecommitdiff
path: root/scripts
diff options
context:
space:
mode:
authorMasahiro Yamada <masahiroy@kernel.org>2024-11-20 08:56:39 +0900
committerMasahiro Yamada <masahiroy@kernel.org>2024-11-28 08:11:56 +0900
commit0c3e091319e4748cb36ac9a50848903dc6f54054 (patch)
tree4e47c766303ff59aca33fa50e588e48d4e456fc3 /scripts
parente2ff1219a5541a22921016219c4d86a6d0190d15 (diff)
modpost: remove incorrect code in do_eisa_entry()
This function contains multiple bugs after the following commits:  - ac551828993e ("modpost: i2c aliases need no trailing wildcard")  - 6543becf26ff ("mod/file2alias: make modalias generation safe for cross compiling") Commit ac551828993e inserted the following code to do_eisa_entry():     else             strcat(alias, "*"); This is incorrect because 'alias' is uninitialized. If it is not NULL-terminated, strcat() could cause a buffer overrun. Even if 'alias' happens to be zero-filled, it would output: MODULE_ALIAS("*"); This would match anything. As a result, the module could be loaded by any unrelated uevent from an unrelated subsystem. Commit ac551828993e introduced another bug.             Prior to that commit, the conditional check was:     if (eisa->sig[0]) This checked if the first character of eisa_device_id::sig was not '\0'. However, commit ac551828993e changed it as follows:     if (sig[0]) sig[0] is NOT the first character of the eisa_device_id::sig. The type of 'sig' is 'char (*)[8]', meaning that the type of 'sig[0]' is 'char [8]' instead of 'char'. 'sig[0]' and 'symval' refer to the same address, which never becomes NULL. The correct conversion would have been:     if ((*sig)[0]) However, this if-conditional was meaningless because the earlier change in commit ac551828993e was incorrect. This commit removes the entire incorrect code, which should never have been executed. Fixes: ac551828993e ("modpost: i2c aliases need no trailing wildcard") Fixes: 6543becf26ff ("mod/file2alias: make modalias generation safe for cross compiling") Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Diffstat (limited to 'scripts')
-rw-r--r--scripts/mod/file2alias.c5
1 files changed, 1 insertions, 4 deletions
diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index c4cc11aa558f..634e40748287 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -809,10 +809,7 @@ static int do_eisa_entry(const char *filename, void *symval,
char *alias)
{
DEF_FIELD_ADDR(symval, eisa_device_id, sig);
- if (sig[0])
- sprintf(alias, EISA_DEVICE_MODALIAS_FMT "*", *sig);
- else
- strcat(alias, "*");
+ sprintf(alias, EISA_DEVICE_MODALIAS_FMT "*", *sig);
return 1;
}