ALSA: ctxfi: Fix out-of-range access

The master and next_conj of rcs_ops are used for iterating the
resource list entries, and currently those are supposed to return the
current value.  The problem is that next_conf may go over the last
entry before the loop abort condition is evaluated, and it may return
the "current" value that is beyond the array size.  It was caught
recently as a GPF, for example.

Those return values are, however, never actually evaluated, hence
basically we don't have to consider the current value as the return at
all.  By dropping those return values, the potential out-of-range
access above is also fixed automatically.

This patch changes the return type of master and next_conj callbacks
to void and drop the superfluous code accordingly.

BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=214985
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20211118215729.26257-1-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>

diff --git a/sound/pci/ctxfi/ctamixer.c b/sound/pci/ctxfi/ctamixer.c
index da6e6350ceafad545aa4e0ef29591ffd2d9e6c4d..d074727c3e21d3edf25f934b259e441a83738b1f 100644 (file)
--- a/sound/pci/ctxfi/ctamixer.c
+++ b/sound/pci/ctxfi/ctamixer.c
@@ -23,16 +23,15 @@
 
 #define BLANK_SLOT             4094
 
-static int amixer_master(struct rsc *rsc)
+static void amixer_master(struct rsc *rsc)
 {
        rsc->conj = 0;
-       return rsc->idx = container_of(rsc, struct amixer, rsc)->idx[0];
+       rsc->idx = container_of(rsc, struct amixer, rsc)->idx[0];
 }
 
-static int amixer_next_conj(struct rsc *rsc)
+static void amixer_next_conj(struct rsc *rsc)
 {
        rsc->conj++;
-       return container_of(rsc, struct amixer, rsc)->idx[rsc->conj];
 }
 
 static int amixer_index(const struct rsc *rsc)
@@ -331,16 +330,15 @@ int amixer_mgr_destroy(struct amixer_mgr *amixer_mgr)
 
 /* SUM resource management */
 
-static int sum_master(struct rsc *rsc)
+static void sum_master(struct rsc *rsc)
 {
        rsc->conj = 0;
-       return rsc->idx = container_of(rsc, struct sum, rsc)->idx[0];
+       rsc->idx = container_of(rsc, struct sum, rsc)->idx[0];
 }
 
-static int sum_next_conj(struct rsc *rsc)
+static void sum_next_conj(struct rsc *rsc)
 {
        rsc->conj++;
-       return container_of(rsc, struct sum, rsc)->idx[rsc->conj];
 }
 
 static int sum_index(const struct rsc *rsc)

diff --git a/sound/pci/ctxfi/ctdaio.c b/sound/pci/ctxfi/ctdaio.c
index f589da04534244e8752e65f090007ecd6d36db91..7fc720046ce293564e513ad78fccda687f45aa38 100644 (file)
--- a/sound/pci/ctxfi/ctdaio.c
+++ b/sound/pci/ctxfi/ctdaio.c
@@ -51,12 +51,12 @@ static const struct daio_rsc_idx idx_20k2[NUM_DAIOTYP] = {
        [SPDIFIO] = {.left = 0x05, .right = 0x85},
 };
 
-static int daio_master(struct rsc *rsc)
+static void daio_master(struct rsc *rsc)
 {
        /* Actually, this is not the resource index of DAIO.
         * For DAO, it is the input mapper index. And, for DAI,
         * it is the output time-slot index. */
-       return rsc->conj = rsc->idx;
+       rsc->conj = rsc->idx;
 }
 
 static int daio_index(const struct rsc *rsc)
@@ -64,19 +64,19 @@ static int daio_index(const struct rsc *rsc)
        return rsc->conj;
 }
 
-static int daio_out_next_conj(struct rsc *rsc)
+static void daio_out_next_conj(struct rsc *rsc)
 {
-       return rsc->conj += 2;
+       rsc->conj += 2;
 }
 
-static int daio_in_next_conj_20k1(struct rsc *rsc)
+static void daio_in_next_conj_20k1(struct rsc *rsc)
 {
-       return rsc->conj += 0x200;
+       rsc->conj += 0x200;
 }
 
-static int daio_in_next_conj_20k2(struct rsc *rsc)
+static void daio_in_next_conj_20k2(struct rsc *rsc)
 {
-       return rsc->conj += 0x100;
+       rsc->conj += 0x100;
 }
 
 static const struct rsc_ops daio_out_rsc_ops = {

diff --git a/sound/pci/ctxfi/ctresource.c b/sound/pci/ctxfi/ctresource.c
index 81ad269345182748a68f9b112c900d18095624c1..be1d3e61309ce2580ed440ce45c16a6813e090d3 100644 (file)
--- a/sound/pci/ctxfi/ctresource.c
+++ b/sound/pci/ctxfi/ctresource.c
@@ -109,18 +109,17 @@ static int audio_ring_slot(const struct rsc *rsc)
     return (rsc->conj << 4) + offset_in_audio_slot_block[rsc->type];
 }
 
-static int rsc_next_conj(struct rsc *rsc)
+static void rsc_next_conj(struct rsc *rsc)
 {
        unsigned int i;
        for (i = 0; (i < 8) && (!(rsc->msr & (0x1 << i))); )
                i++;
        rsc->conj += (AUDIO_SLOT_BLOCK_NUM >> i);
-       return rsc->conj;
 }
 
-static int rsc_master(struct rsc *rsc)
+static void rsc_master(struct rsc *rsc)
 {
-       return rsc->conj = rsc->idx;
+       rsc->conj = rsc->idx;
 }
 
 static const struct rsc_ops rsc_generic_ops = {

diff --git a/sound/pci/ctxfi/ctresource.h b/sound/pci/ctxfi/ctresource.h
index fdbfd808816d373a8587cce9b840b84281a469d9..58553bda44f436316d29e0b7b14fcdd187ea57ff 100644 (file)
--- a/sound/pci/ctxfi/ctresource.h
+++ b/sound/pci/ctxfi/ctresource.h
@@ -39,8 +39,8 @@ struct rsc {
 };
 
 struct rsc_ops {
-       int (*master)(struct rsc *rsc); /* Move to master resource */
-       int (*next_conj)(struct rsc *rsc); /* Move to next conjugate resource */
+       void (*master)(struct rsc *rsc); /* Move to master resource */
+       void (*next_conj)(struct rsc *rsc); /* Move to next conjugate resource */
        int (*index)(const struct rsc *rsc); /* Return the index of resource */
        /* Return the output slot number */
        int (*output_slot)(const struct rsc *rsc);

diff --git a/sound/pci/ctxfi/ctsrc.c b/sound/pci/ctxfi/ctsrc.c
index bd4697b44233467c687033aeb7194ef85132443c..4a94b4708a77e55f9ee81315b1d0f725c8cc3a33 100644 (file)
--- a/sound/pci/ctxfi/ctsrc.c
+++ b/sound/pci/ctxfi/ctsrc.c
@@ -590,16 +590,15 @@ int src_mgr_destroy(struct src_mgr *src_mgr)
 
 /* SRCIMP resource manager operations */
 
-static int srcimp_master(struct rsc *rsc)
+static void srcimp_master(struct rsc *rsc)
 {
        rsc->conj = 0;
-       return rsc->idx = container_of(rsc, struct srcimp, rsc)->idx[0];
+       rsc->idx = container_of(rsc, struct srcimp, rsc)->idx[0];
 }
 
-static int srcimp_next_conj(struct rsc *rsc)
+static void srcimp_next_conj(struct rsc *rsc)
 {
        rsc->conj++;
-       return container_of(rsc, struct srcimp, rsc)->idx[rsc->conj];
 }
 
 static int srcimp_index(const struct rsc *rsc)