4.19-stable review patch. If anyone has any objections, please let me know.
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From: Oswald Buddenhagen oswald.buddenhagen@gmx.de
[ Upstream commit 89b32ccb12ae67e630c6453d778ec30a592a212f ]
In load_data(), make the validation of and skipping over the main info block match that in load_guspatch().
In load_guspatch(), add checking that the specified patch length matches the actually supplied data, like load_data() already did.
Signed-off-by: Oswald Buddenhagen oswald.buddenhagen@gmx.de Message-ID: 20240406064830.1029573-8-oswald.buddenhagen@gmx.de Signed-off-by: Takashi Iwai tiwai@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- sound/synth/emux/soundfont.c | 17 +++++++++++------ 1 file changed, 11 insertions(+), 6 deletions(-)
diff --git a/sound/synth/emux/soundfont.c b/sound/synth/emux/soundfont.c index 31a4ea94830e0..235b16af6083d 100644 --- a/sound/synth/emux/soundfont.c +++ b/sound/synth/emux/soundfont.c @@ -710,7 +710,6 @@ load_data(struct snd_sf_list *sflist, const void __user *data, long count) struct snd_soundfont *sf; struct soundfont_sample_info sample_info; struct snd_sf_sample *sp; - long off;
/* patch must be opened */ if ((sf = sflist->currsf) == NULL) @@ -719,12 +718,16 @@ load_data(struct snd_sf_list *sflist, const void __user *data, long count) if (is_special_type(sf->type)) return -EINVAL;
+ if (count < (long)sizeof(sample_info)) { + return -EINVAL; + } if (copy_from_user(&sample_info, data, sizeof(sample_info))) return -EFAULT; + data += sizeof(sample_info); + count -= sizeof(sample_info);
- off = sizeof(sample_info); - - if (sample_info.size != (count-off)/2) + // SoundFont uses S16LE samples. + if (sample_info.size * 2 != count) return -EINVAL;
/* Check for dup */ @@ -751,7 +754,7 @@ load_data(struct snd_sf_list *sflist, const void __user *data, long count) int rc; rc = sflist->callback.sample_new (sflist->callback.private_data, sp, sflist->memhdr, - data + off, count - off); + data, count); if (rc < 0) { sf_sample_delete(sflist, sf, sp); return rc; @@ -962,10 +965,12 @@ load_guspatch(struct snd_sf_list *sflist, const char __user *data, } if (copy_from_user(&patch, data, sizeof(patch))) return -EFAULT; - count -= sizeof(patch); data += sizeof(patch);
+ if ((patch.len << (patch.mode & WAVE_16_BITS ? 1 : 0)) != count) + return -EINVAL; + sf = newsf(sflist, SNDRV_SFNT_PAT_TYPE_GUS|SNDRV_SFNT_PAT_SHARED, NULL); if (sf == NULL) return -ENOMEM;